Which PS system has the best first party lineup, and why?

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Yeah I'm gonna go with the PS3 as well.

From gritty FPS like Killzone and Resistance, to colourful platformers like Puppeteer, Ratchet & Clank, and LittleBigPlanet, to third person action adventure blockbusters like Uncharted, TLOU, and Infamous, to arcade racers like the Motorstorm trilogy, Modnation, and Wipeout HD, the level of quality, variety, and volume was superb.