well, it all depends on who you ask. anyone from MS will tell you that the Xbox 360 is the leader whereas most sites are giving out different information.

point being, if i was releasing a game such as Final Fantasy, the 360 wouldn't be the one i would pick. though, i don't know how many people who own a Wii have the classic controllers so i don't know what it would be like to play FF on the Nintendo 'chucks' they have.