I already have P3P, in fact bought it twice, once UMD then again during PSN sale so I could play it on Vita. Totobeni is raging somewhere right now.
I'm weary of Y's series, I tried a couple, one being way back on Turbografx that really turned me off the series.
I got the PSP version free from the PSN debacle. Thats why i'm a little leery from getting LBP Vita. I bought the first one, got 2 free through PS Plus and the PSP version free but could never get into them. The console versions I know for sure was because I had a problem sitting there playing them on the TV and wanted to create stuff but felt tied down and overwhelmed. The PSP version just didn't feel right and most people are saying the Vita version is great because it feels better on all those counts.
Seriously try seven or Oath
they all play completely different