I prefer Mega Char X over Y because of the blue flames and the dragon/fire typing. Out of all the Mega evolutions overall, Mega Diancie and Mega Altaria are my favorite based on design. I like using Mega Gyarados and Mega Kangaskhan for battling too.
Y. I like his combination of stats and skills, as well as his remaining true to his original typing and colour scheme. X just seems too... fanservice-y for me.
I like Mega Charizard X over Y in terms of design. Also, he becomes a legit dragon type. In terms of other Mega Pokémon, Mega Kangaskhan is my favorite overall because it is the most adorable of the bunch imho.
From the Charizards, I like Y better because X is just a blatant genwunner pandering attempt. Y is more like a Mega Evolution since it actually looks like the source material (a normal Charizard). Out of all the Mega Evolving Pokémon, I like Mega Gallade and Altaria, I just can't pick! Mega Gallade looks regal yet deadly which is awesome, and Mega Altaria is just a big soft ball of floofyness. Who would object to a big ball of floofyness?
mega charizard x because it takes the awesome color scheme of shiny charizard, but instead of red, it uses blue, my fav color
I like Mega Charizard X because of typing that needed to happen a long time ago and the color scheme. (though, I always thought that the wings were a bit weird)
I also prefer Charizard X, also for the reasons that were mentioned earlier. But considering the other Mega-Evolutions, I also like Mega-Diancie because of it's design and also Mega-Blaziken because of it's overpowered ability.
Mega Charizard Y is awesome. X on the other hand looks horrible imo. It is actually my least favourite Mega Evolution. As for my favourite Mega Pokémon overall, Mega Lopunny and Mega Aggron take the spot. I think both of them have really nice designs that are appealing to the eye. Mega Lopunny is also what made me appreciate regular Lopunny much more, so yeah. Mega Pidgeot, Mega Blaziken, Mega Mewtwo Y, Mega Scizor, Mega Tyranitar, Mega Rayquaza, and Mega Swampert are other some of my other fave Mega Pokémon.
My favourite mega evolution is mega Garchomp. In all honesty, I don't have much experience with mega evolution itself; I skipped over generation 6, and as we all know mega evolution wasn't really brought back for generation 7, which is a real shame because in my opinion, it's one of the most interesting new mechanics to be introduced into the series. I've used mega Garchomp in Pokémon Ultra Moon, and it's a real powerhouse. I also really appreciate his design. The scythe-like arms were a really nice touch.
Charizard Y is amazing for sun teams, but I have way to much fun sweeping people with Dragon Dance Char-X My favorite Megas are probably Sableye and Mawile, along with Beedrill. Sableye is the best tank ever, Mega Mawile is stupid strong, and Mega Beedrill Fell Stinger sweeps are the best thing ever XD. Plus they all look cool
Charizard X over Charizard Y any day of the week. Gamefreak finally gave Charizard the Fire/Dragon typing it has deserved since the beginning and the black body with blue flames is sick. Next favorite Mega evo is definitely Steelix. Doesn't get enough credit but it is a bulky offensive MONSTER <3
My favorite Mega is probably Mega ~~Floof~~ Altaria! It's just so fluffy and cute... Mega Audino and and Diancie are runner ups. I have an affinity for cute and Fairy Pokémon.
My favorite Mega is Mega Aggron. Beastly and logical design, better typing and ability. Plus I love a good Tank and it is one of the tankiest. For the Poll: I prefer X over Y and I feel like it should have just been that as a mega evolution. Y felt shoehorned to just make Charizard a ridiculous powerhouse for the sake of popularity.
I've never used either of the Charizard megas, so I don't know if I have much of a preference, but I prefer that Y looks more like Charizard and doesn't have the dragon type. X kind of ruined the joke. My favorite mega over all is probably Absol. As an absolute troll, I love Magic Bounce.
Charizard X just looks significantly cooler in design. I get what Game Freak was going for with the whole draconic design thing in Y, but I feel X is much more intimidating and menacing which is a good thing. Out of every mega evo though, Mega Latis and Mega Mawile are my definite favourites! Close favourites are Mega Gardevoir, Mega Gallade, and Mega Diancie.