AC/DC. The Pro is a fast, flow oriented game, more so than the Premium since it doesn't have the lower playfield and the left ramp diverting rail to stop things. Metallica is a great game but is a very stop and go sort of game. It also takes a good bit of work to get Seek & Destroy going (which is pretty crucial if you want a decent score), and it might get repetitive working towards that every game you play.