BEST? That is waaaaaaay too subjective. (Exhibit A: Even before I had to go gluten-free, the idea of carrot cake ANYTHING made me gag. Still does. So to me that would NEVER be a "best" anything.)
Favorite would be the better question IMHO. I'm pretty simple - if there's not a Dole Whip available, give me a Mickey Bar. To me, those are the best - but most people probably don't agree.