I always preferred Batman: Arkham Asylum to Batman: Arkham City, but the gap this time was much larger and I have to assume it's at least partially due to the time gap between playthroughs being so small this time around; I just think playing these games back to back does Arkham City no favors. That said, and regardless of how time affected my feelings, I still think Arkham City is a worse game in almost every way, going for quantity over quality (except when it comes to the main storyline, which is actually shorter than Arkham Asylum's). It is by no means bad, man, but unlike its older brother, it's no "greatest game of all time" contender.