Little Big Planet on Vita is the best one in the series and the definitive LBP experience overall. I haven't really enjoyed the games made by Media Molecule. Very original and creative stylistically they just weren't fun to play for me. While MM were busy with making Tearaway, other studios picked up their ideas and made a game with much tighter, exciting and varied gameplay. From start to finish I wasn't bored for a minute and closer to the end LBP Vita even became fairly challenging in a few sections. Soundtrack is fantastic, and addition of unlockable minigames and real voice acting instead of murmuring are much appreciated.

In my opinion, Vita has way too few strong exclusives like this to justify the purchase of the console, so I can't really call this a killer app, but if you happen to be an unlucky owner of the system or if you're as lucky as me to have a friend with a Vita to borrow it from, I'd say you shouldn't miss LBP Vita. The game's super fun.