Which do YOU like better? ^-^

Okay, so I started playing Saints Row (2) Yesterday, and I completely fell in love with the game. (I'm almost finished with it). So, um. I was wondering which YOU like better. Grand theft auto 4, or Saints Row 2? Both are bad ass, both have guns and freakishly fun missions, so I'm guessing this is a hard question. ^-^ Tell me which, then tell me why?