Buy the Cosori TurboBlaze.

It fries better, quieter, and cleans up easier, for sixty dollars less.

What was compared

Cosori TurboBlaze Air Fryer, 9-in-1, 6 Qt, PFAS-Free Ceramic Coating | 90°–450°F, 5 Level ... — $89.99
Ninja Flip Toaster Oven & Air Fryer, 8-in-1, Stainless Steel, SP151 | Air fry, bake, broil... — $149.94

1. Wins the actual cooking test, head to head
Reviewers who tested both directly say the Cosori just does a better job, calling it faster and more consistent than the Ninja Flip. That is the one thing an air fryer is bought to do, and Cosori takes it clearly.
2. Runs quiet, the Ninja does not stay that way
Owners describe the Cosori as quiet in both its fan and its beeps, while a Ninja owner reports the fan starting to make a terrible noise after 18 months. A kitchen appliance you use daily should not get louder as it ages.
3. Food slides out, it does not bake onto the basket
Cosori testers describe food lifting off cleanly with quick rinsing, even fried rice sliding right out. Ninja owners describe oil getting blown around and caking on hard to remove, plus crumbs building up fast in the flip design.
4. Sixty dollars back for a machine that cooks as well
At $89.99 against $149.94, the Cosori costs noticeably less while multiple direct comparisons call it the more consistent cook. Paying more for the Ninja only makes sense if you specifically need its toaster-oven extras, not for air frying alone.
5. Yes, the Ninja fits more and toasts bagels. Skip it anyway.
The Ninja's XL capacity and toast/bagel modes are real if you cook big batches or want a toaster oven combo, and if that is you, it is a fair reason to buy it. But for a straight air fryer used daily, that is not most buyers, and the Cosori's 6 quarts already serves 3 to 5 people.