When looking at the developer i think the work environment should be taken into consideration also. Insomniac is essentially an adult day care. Whereas polyphony, for example, is more like a video game sweatshop. They chain people to their workstations and make them sleep under their "desks" (i put desks in quotes because they are actually made out of mountains of their work, so not traditional desks). They also work months, and months, and months designing a single car.
What you want is the best effort to result ratio. So, since insomniac barely works and can still put out good games, they are clearly the best.
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MrBubbles Review Threads: Bill Gates, Jak II, Kingdom Hearts II, The Strangers, Sly 2, Crackdown, Zohan, Quarantine, Klungo Sssavesss Teh World, MS@E3'08, WATCHMEN(movie), Shadow of the Colossus, The Saboteur