Well... I can't tell for sure just yet. I haven't played PMD 2. But right now I'm thinking PMD2 is what I will like more.
Though I have heard that this time around the game will focus less on friendship, which was one of the things I really liked in PMD because there were some parts that really got me involved. Right when they left Mt. Blaze, before they entered Frosty Forest, and definitely at the end. I'm hoping that what I've heard isn't true though, I might have to say that PMD is my fave if thats the case.