The catch
Breville Smart Oven Air Fryer Pro
An integrated food thermometer is not included.
Side by side
Breville BOV900 Air Fryer Pro vs Ninja DT551: Ninja tracks food temperature and Breville slow-cooks, at the same toast count
Quick verdict
A documented 9 x 13-inch pan fit and Proof and Slow Cook modes are the reasons to choose Breville BOV900. The included Pro Cook thermometer and two-level cooking setup are the reasons to choose Ninja DT551. Since both advertise nine-slice toast and include two racks, basic breakfast capacity does not favor either one.
Before you buy
Why, and what it costs you
This comparison is not settled by nine-slice toast
The advertised toast count is the same on both, so a larger breakfast gives little reason to switch from one to the other. Bread fit and real toast evenness still need checking.
Where this comes from
No comparative toast test was performed. Extra advertised slice positions: 9 - 9 = 0.
The catch
Ninja Prestige Smart XL Air Fryer Countertop Oven Pro Cook
Its ten-mode list has no dedicated Proof or Slow Cook function.
Breville Smart Oven Air Fryer Pro
- Why pick it
- Suitable 9 x 13-inch pans and a five-quart Dutch oven get used
- Dedicated Proof and Slow Cook functions stay on hand
- The catch
- An integrated food thermometer is not included.
Ninja Prestige Smart XL Air Fryer Countertop Oven Pro Cook
- Why pick it
- The included wired food probe ends supported cooks
- Two supplied sheet pans are ready for two-level recipes
- The catch
- Its ten-mode list has no dedicated Proof or Slow Cook function.
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What this page compares
Breville BOV900 and Ninja DT551 are compared on a 9 x 13-inch pan, proofing, slow cooking and probe-controlled roasts. Nine-slice toast is advertised for both.
A documented 9 x 13-inch pan fit and Proof and Slow Cook modes are the reasons to choose Breville BOV900. The included Pro Cook thermometer and two-level cooking setup are the reasons to choose Ninja DT551. Since both advertise nine-slice toast and include two racks, basic breakfast capacity does not favor either one.
Which one fits
Pick the situations that sound like you
The main reason I would buy is my existing 9 x 13-inch casserole
Most pans of that size are documented by Breville. For either oven, check the exact outer dimensions.
- Breville Smart Oven Air Fryer Pro
- Good
- Ninja Prestige Smart XL Air Fryer Countertop Oven Pro Cook
- Depends
I want a named mode for proofing bread dough
BOV900 has Proof, which DT551 leaves off its list.
- Breville Smart Oven Air Fryer Pro
- Better fit
- Ninja Prestige Smart XL Air Fryer Countertop Oven Pro Cook
- Not suitable
I want a probe target to end the cook
The integrated thermometer system comes only with DT551.
- Breville Smart Oven Air Fryer Pro
- Not suitable
- Ninja Prestige Smart XL Air Fryer Countertop Oven Pro Cook
- Better fit
Nine advertised toast positions are what I need
That published capacity is met by both.
- Breville Smart Oven Air Fryer Pro
- Good
- Ninja Prestige Smart XL Air Fryer Countertop Oven Pro Cook
- Good
I want to cook two dishes, each at its own set temperature
Even with two racks, each is a single-cavity oven.
- Breville Smart Oven Air Fryer Pro
- Not suitable
- Ninja Prestige Smart XL Air Fryer Countertop Oven Pro Cook
- Not suitable
In practice
Differences you will notice
This comparison is not settled by nine-slice toast
The advertised toast count is the same on both, so a larger breakfast gives little reason to switch from one to the other. Bread fit and real toast evenness still need checking.
How we worked this out
No comparative toast test was performed. Extra advertised slice positions: 9 - 9 = 0.
Different meals suit a casserole dish and two smaller trays
Most 9 x 13-inch pans are explicitly supported by BOV900, and DT551 advertises two 9 x 9-inch trays. Do not assume a single long casserole fits just because an oven can cook on two levels.
How we worked this out
Each manufacturer's fit example covers a different shape and rack arrangement. Handles and rims on a pan can extend past its nominal cooking dimensions.
Different recipes benefit from the automation
Dough and long low-temperature cooking get Proof and Slow Cook modes from Breville. Ninja offers food-probe feedback for supported roasts. Neither feature can stand in for the other's task.
How we worked this out
Proof and Slow Cook are on BOV900's function list, with no integrated probe. DT551 documents probe-controlled cooking and leaves out those two named modes.
Option A
Breville, BOV900BSSUSC
Smart Oven Air Fryer Pro
Thirteen modes, including slow cook and dehydrate, come with a one-cubic-foot cavity that has room for broad pans and strong convection.
- Best for
- Suitable 9 x 13-inch pans and a five-quart Dutch oven get used
Facts we checked
- Toast capacity: 9 slices
- Food-temperature control: No integrated probe
- Large-pan guidance: Fits most 9 x 13-inch pans
- Proof and Slow Cook: Both listed
Option B
Ninja, DT551
Prestige Smart XL Air Fryer Countertop Oven Pro Cook
A Pro Cook system that tracks food temperature at the appliance comes with this two-level XL oven from Ninja.
- Best for
- The included wired food probe ends supported cooks
Facts we checked
- Toast capacity: 9 slices
- Food-temperature control: Pro Cook wired thermometer
- Large-pan guidance: Advertised for two 9 x 9-inch baking trays
- Proof and Slow Cook: Neither listed
Spec by spec
Where they really differ
| Spec | Breville Smart Oven Air Fryer Pro | Ninja Prestige Smart XL Air Fryer Countertop Oven Pro Cook | In practice |
|---|---|---|---|
| Toast capacity | 9 slices | 9 slices | Advertised breakfast load comes out the same. |
| Food-temperature control | No integrated probe | Pro Cook wired thermometer | Internal-food monitoring, with supported automatic heating shutoff, is Ninja's addition. |
| Large-pan guidance | Fits most 9 x 13-inch pans | Advertised for two 9 x 9-inch baking trays | Do not treat different examples as equivalent. Look at the complete outer dimensions of the pan. |
| Proof and Slow Cook | Both listed | Neither listed | Documented modes for dough proofing and long slow cooking are Breville's. |
| Supplied racks | 2 | 2 | The Ninja is not alone in having an extra wire rack. |
| Body height | 12.7 inches | 13.35 inches | Breville is shorter by 0.65 inch, which says nothing about whether installation clearance is adequate. |
Trade-offs
What each pick costs you
With Breville Smart Oven Air Fryer Pro
- At 21.4 inches wide, the body needs additional operating clearance.
With Ninja Prestige Smart XL Air Fryer Countertop Oven Pro Cook
- Your 9 x 13-inch dish is not guaranteed to fit, and two levels still share one oven temperature.
Change of plan
When the answer changes
You often need Proof and Slow Cook
Go with Breville Smart Oven Air Fryer Pro. Both dedicated modes are on BOV900's list.
The main task is roasts controlled by a probe
Go with Ninja Prestige Smart XL Air Fryer Countertop Oven Pro Cook. The Pro Cook thermometer comes with DT551.
Two independent cooking temperatures are what I need
Neither model fits. Each gives you a single cooking cavity.
Decision guide
How to decide
Breville BOV900 earns the nod for a documented 9 x 13-inch pan fit and its Proof and Slow Cook modes, and Ninja DT551 for the included Pro Cook thermometer and two-level cooking setup. With nine-slice toast advertised on both and two racks included, basic breakfast capacity should not sway you toward either one.
Your own cookware comes first
A pan's printed size usually describes the cooking area and leaves out the handles and rims. Breville's statement about most 9 x 13-inch pans is useful, but it carries a qualifier. Before you buy, measure the dish you plan to keep using and verify its complete dimensions.
Match the automation to the food
Proofing bread, cooking a long slow-cooked meal and roasting by probe each ask something different of an oven. Dedicated modes on the BOV900 cover the first two, and the integrated probe on the DT551 addresses the third. A larger function count by itself does not show which appliance serves your menu better.
Racks are not the same as separate ovens
Two wire racks come with both. The DT551 also supplies two sheet pans and a specific two-level workflow. Those two racks stay inside one chamber, so recipes need compatible temperatures and suitable positions. Independent two-dish temperature control calls for a different appliance arrangement.
What this page can’t tell you
- Baking uniformity, air frying, probe accuracy and speed are things we have not tested. Published pan examples and toast counts are capacity guidance. They are not measured results.
By the numbers
What the data shows
What we found across the countertop ovens we compare, plus the checked facts behind each finding.
Show the facts and the math
| Product | Needs it meets | Facts we checked | Sources |
|---|---|---|---|
| Breville Smart Oven Air Fryer Pro |
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| Ninja Prestige Smart XL Air Fryer Countertop Oven Pro Cook |
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Ready to buy
See today’s price and what owners say
Open either model on Amazon for the current price, customer reviews and delivery options.
Breville Smart Oven Air Fryer Pro
Suitable 9 x 13-inch pans and a five-quart Dutch oven get used
See price & reviews on AmazonNinja Prestige Smart XL Air Fryer Countertop Oven Pro Cook
The included wired food probe ends supported cooks
See price & reviews on AmazonEach link opens in a new tab.
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