This or That Game

[SERIOUSLY THOUGH]

Depends on the game but I'd tend to lean towards a good RTS

Getting to chose any power from any character in any videogame and being able to use it for ever, with the collateral that the cast of Jersey Shore become unilateral rulers of the world
or
Getting to nuke the cast of Jersey Shore, with the collateral of making you get arrested and put in prison for the rest of your life