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X is just an inferior mixed sweeper that still gets shit on by rocks. Y is a monstrous sp. attacker with Drought. He's just better by default.
Visually X has strange wings, pointless shoulder horns, and the flames look terrible in game. Y looks like a more powerful, natural progression of Charizard, and the little wyvern wings are a nice touch, as a nod to his non-dragon typing.
And honestly, just look at this smug motherfucker.