I don’t know if nostupidquestions would’ve accepted the question (they tend to reject questions aimed at viewer experience)

Some might take the fact that it's too stupid for nostupidquestions as a sign. :)

Humorous hyperbole or not, it's still an unanswerable question. How can you interpret it? "Which do you personally prefer?" - who really cares whether some random person prefers chocolate over vanilla and if you want to know what's common it's easy to find surveys. "If you prefer one, why?" - uhh, "it tastes better to me". What else can one really say?

At least something like "If you had to prove chocolate is better than vanilla or vanilla is better than chocolate, is there a food or recipe you'd use?" I didn't take the time to make it sound like a decent title, but at least that general approach might encourage interesting discussion, sharing foods people not have been aware of already, recipes, etc. There's nowhere really to go with this post though.