I liked P4 on Vita, didn't care much for P3 but that was likely because I played the PSP version that stripped out some of the charm. I'm considering getting SMTIV, since SMTIII is not available on a handheld system (not sure why they didn't give Vita a built in PS2 emulator like PSP had for PS1 games). Is the battle system the same in SMT as in the Persona games? What's the main difference between the gameplay for the two series?