Pineapple
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.
Orange
It has the classic welcoming orange soda flavor everybody needs.
Grape
Not many people actually like artificially grape flavored soda/candy/food but it tastes pretty good to me.
Mango
Same reason as grape
Peach
Peach is good for a wide variety of reasons,, but idk it just tastes good,, and that's kind of enough