Do you even have to ask???
Tough..but I'll go with Capcom, they've released SO MANY DAMN games I like it's not even funny, followed by Nintendo, SONY, Square-Enix, and the rest.
This post is soaked in fanboy
I like Kojima(MG/MGS/ZOE), Nomura and Kitase (Yeahyeah), or the Monolith Soft(for my favorite,Xenosaga!) team even without Takahashi and Saga onboard. I praise Miyamoto for all he's done for the industry and for his games with Zelda and Mario and the like. I really like Shinji Mikami for starting the ever wonderful Resident Evil series and having his hand in Devil May Cry too. I know those aren't everybody responsible for the games or whole companies but meh.