would you perfer to play a game where you have 1 character card as your avatar or a game with lots of characters like in pokemon or yugioh?
Well Pokemon/Yugioh creatures aren't avatars, more like minions.
Whereas Hero cards in WoW are your avatar.
Not sure if the distinction matters but depends on the game really.
I'd prefer to play both games because they really are pretty different kinds.
I think it really depends on how you want to make your card game, there's probably a lot of people that like either way.
To be honest, I see no reason why you can't do both. Though I'd probably go with lots of characters, considering that's how my favorite CCGs played it.