The 3DS XL has a really big screen, though. DDS has no alignments, yes, and is in general probably the most FF-like game in the series in how narrative and characters are emphasized. Still ultra challenging dungeons though.

I wouldn't classify Nocture or SMTIV's battle system as inferior to P3's, just different takes on a similar idea. I know at least one person who did not enjoy the P3 battle system at all, so don't expect it to be the Second Coming of Christ or anything. I actually think the full press-turn system in Nocturne, DDS and IV is more interesting than the Once More mechanic. Persona is just flashier.

And a warning: the final boss' second form has an insta-kill attack that cannot be resisted in any way. If it hits your character, it's game over. And since you have a four-member party, that's a 25% chance of failure, potentially every turn. Don't even try to use those gems that protect you from death because that just makes her use it on her first turn. Just a heads up that the real final battle is a luck-based mission.