I love Mass Effect 2 for the story and environments. But I love Mass Effect 3 for the gameplay, the more RPG elements to the weapons and I liked the icon highlighting items you found a million times more (that doesn't sound like much but it was huge for me). But Mass Effect 2 was "my first" so it will forever be my favorite.
10/18 - King Diamond
10/24 - Pallbearer
11/01 - Suffocation
11/30 - Devin Townsend
12/06 - Distant Worlds: the Music of Final Fantasy