I've only played Disgaea and PB. I like PB's dungeon system better than Disgaea's item system. Laharl is a better character than Ash. I think the angel girl from Disgaea is more annoying than Marona from Phantom Brave.
Enhancing items in Disgaea was . . . interesting . . . but enhancing items in PB is easy. Although, the equipment system can be annoying.