God Eater

http://www.godeater.jp/
For the PSP, God Eater seems highly possible to be a Monster Hunter killer. Well, it's no surprise they're probably often compared to each other but there are some points that makes me lean towards GE.

Point 1: On-the-fly weapon switching. Your weapon (Shinki) has 3 forms: sword, gun and devour. Sword has 3 forms, gun has 3 forms. Each form has difference in attack speed and recovery amd damage. Devour form lets you power up for a short period of time and lets you use special bullets. Since the story characters are stuck to one form with the exception of Arisa, you've got to fill in the roles lacking in the party

Point 2: Go Shiina = Awesome music. Liste to BGM2 at the official site, or the short music clips under Special. I took notice of Go Shiina after I played Tales of Legendia. It was new, unique and very different compared to the other Tales games done by Sakuraba Motoi

Point 3: Multiplayer. Sidestep. Dash. Sakamato Maaya (LOL) as Arisa, Sunohara ( I mean Sakaguchi Daisuke)