PC. the ability to mod your game (what do you mean you don't wanna see boobies when you steal equipment from a woman in Skyrim?), less hardware limitation (HDD caching in bethesda's console games, anyone?), and actual control of the visual quality of the game is too massive a plus.
but if we're gonna focus exclusively on consoles, then personally, the PS3. just a matter of personal preference on the console exclusives; more of an Uncharted, & GoW kinda guy, than a Halo & GoW fan. plus the PS1 classics. i love me some nostalgia.