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Here's how the average person should go about deciding whether to play a Pokémon game.
If it has a third version, play that over the paired versions
If it's a remake, play one of them over the original versions (with the exception of ORAS)
So there you go
FireRed or LeafGreen
Emerald
Platinum
HeartGold or SoulSilver
Black or White
Black 2 or White 2
X or Y
Sun or Moon
There's no Z, and we're not going to be seeing Kalos again for a long time, so might as well get X or Y. Even if you don't like it, at least you'll know.