PS3, but it took awhile to get there. Valkyria Chronicles was my first must have for the PS3, and it finished strong with Ni no Kuni and Tales. I drove to Texas to get a 60GB fatty.
Wii was second. Solid start with SMG, Wii Sports, Fire Emblem, tepid middle (I loved Punch-Out though!), strong finish with Zelda and the OpRainfall Three.
360 was good in the early years of the gen but after Tales of Vesperia came and went I lost interest in it. The E74 error didn’t help much either.