Pokémon X and Pokémon Y

So since we get a free event Torchic tomorrow, which Kanto starter would it be smarter to pick? Or, should I say, which has the best Mega Evolution? I was thinking Venusaur seems to be the best, but I dunno... I didn't want to get Charmander for Mega Charizard X and then also have Torchic which would become Mega Blaziken...

 Spoiler

In post-game, you can get the mega stones for the other 2 Kanto starters. as well as being able to catch them in friend safari. So I wouldn't worry about it too much.

I suggest just picking the one you like the most and feel the most comfortable using.

Also anybody that plays through the game with 3 starters in their party is not playing the game right