While I like Mega Charizard Y for how it manages to be a great improvement on Charizard's original design, I'm probably go with the huge stream of of the Charizard X lovers, simply because I find it be much cooler. I mean, apart from the colours, there isn't really much of difference between them, but their selection of colours for Charizard X just seemed to fit much better. The idea to make Charizard X primarily black-coloured probably came from the huge popularity of shiny Charizard, though the blue flames are a really nice touch. I kinda feel like Charizard Y has been overshadowed a bit by that though, since I don't see many who favour that version :(