Just look at the top 20 on each platform and you'll know.
Regarding fun, that is one thing most Nintendo fans get wrong. It isn't only Nintendo that is fun, nor is just the type of games they do is fun. Entertainment and fun are more broad, every body plays to get a good experience and that comes in several different ways. Even shooting others in FPS is fun to the people that like that type of game.
Xbox fans have entered the server.