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Spinach, onions, celery, broccoli, bok choy, carrots… These are certainly not fruits. Vegetable is a culinary term, but so is fruit.

Outside the context of a botany classroom, you’re going to have a hard time finding people who respond to the question “Is cucumber a vegetable or a fruit?” with the answer “fruit, of course!”

Aren’t fruits only plants which contain seeds? Like a celery would not be a fruit

Mostly. There are some “seedless” fruits (bananas, grapes, etc) which have been bred to be defective, or have become defective because of some natural mutation. [1]

There’s also fruits like coconuts, which don’t have seeds like we normally think of them. The coconut we eat after removing outer layers (exocarp, mesocarp) is a seed.

[1] https://en.wikipedia.org/wiki/Parthenocarpy

Isn't "which is best" a culinary distinction?

Comparing sweets fruit to savoury might not make sense in this context, though this is one instance were we can compare apples to oranges..