It depends on the species you are trying to catch and type of location that you are fishing.
If I were fishing for Barbel & Chub in a stream or river or for Tench & Crucians in my local estate lake then I might choose a spicy flavour as first choice, but there are days when the Tench & Crucians may prefer a fruity flavour.
I’m not sure if the Carp prefer either fruity or spicy but overall I catch more Carp on spicy flavours.
As for silvers like Roach, Rudd or Dace I much prefer to use naturals or some form of bread so flavouring isn’t really that relevant.
Keith