This goes without saying, pineapple is hands down the best Fanta flavor, for school parties you either got orange or pineapple, and pineapple was always the one first chosen, and the one that would run out the fastest.
It has the classic welcoming orange soda flavor everybody needs.
Not many people actually like artificially grape flavored soda/candy/food but it tastes pretty good to me.
Same reason as grape
Peach is good for a wide variety of reasons,, but idk it just tastes good,, and that's kind of enough