Sony: Polyphony Digital by far. They have the highest selling exclusive on the ps2 and the highest selling on the ps3, it's no debate.
MS: It was Bungie, but now that they left, it's probably Rare. I have a feeling 343 Studios will take Rare's place once they start making games.
Nintendo: I'm not that familar with their developers, but I would have to probably go with Mario developers or Game Freak.







