BL2... at first I had the opposite opinion but now that I've played through the game several times I like BL2 more.
One thing that's funny is after playing BL2 for a while I put in BL and was surprised there was no mini-map. lol I could have sworn there was a mini-map on that game and I've beat it no less than 12 times. I would have lost a bet on that.
Spoiler for HIT-GIRL CORRIDOR *BEST.SCENE.EVER!* :