Should I get Arcana Heart 3: Love Max for the Vita? I loved the original AH3 release for the PS3 a few years ago, but I'm worried about the controls on the Vita.
No, the loading times are awful, and you will never find anyone online because not only is it not cross-platform with the PS3, they also broke cross-region (and have clearly stated that they never intend on fixing it).
Since then Aksys Games has been running on damage control and have made it very clear that GGXrd and UNIB will definitely be cross-region compatible.
I'd say don't bother with it at all, even the PS3 version, because the game has so very little added content compared to vanilla AC3 that it's almost insulting that this was a full release and not just a patch. It's basically just a balance patch!!
Arcana Heart is forever cursed by bad stuff that prevents it from succeeding, the vanilla AC3 was also DOA due to being released the week of the 2011 PSN hack.
Just to add on to this, they've already announced a new version for arcades. So pass on it.