(Lunar 1 for PSX has some issue when you level up the game pauses slightly then continues, Valkyrie Profile is another PSX game with serious issues...................fortunately both of these games have full remakes on psp that the vita can play with henkaku..................I think the Tales of Destiny1 by Gemini Translation Works on vita, the other one did not. I don't think any of the other major titles have any issues................the psp and ps1 games seem to work better on vita, I have both so its easy to tell.)
What I'm really curious about, is PSTV versus VITA (handheld) emulation. Everyone doesn't seem to realize how broken emulation on anything that isn't ps1 or psp is. Some emulation on the PS2 for example is much better than the PSP VITA, so these are just badly programmed to begin with................Retroarch even uses these bad builds of emulators, apart of the real problem, is how they are designed with "accuracy" that is an immediate performance killer, so the builds were not even sincere to begin with. (pixel accuracy, resolution accuracy, etc. those thing you can't really tell with the naked eye, let along on a hand held, just avoid the trouble, its not worth it on the vita)
True, current generation games are really that poor in quality, when you design something to service an online company, then everything else is degraded, its a simple formula of man hours. If PSP Vita had perfect emulation, then nobody would want much of the new stuff. I think the quest for emulation on a home console died with the XBOX1, that console had a lot of time and energy put into emulation then it dropped dead, there's nothing much going on there now.
(Recently purchased "Berserk" on the Vita, rather then the PS4 which I also own, the quality of the game is lacking I don't think a few graphic upgrades can fix that, been doing that a while with this cross over games. Real shame to see the Vita go, when it does finally kick the bucket)
(Think about the next Sony Console, would you really buy it? or would you buy the next great handheld that can go online, on the home tv and be portable. Now Imagine if Sony did not have a handheld, would you have really of bought the ps4. There are so many thing wrong with the gaming industry right now, that we have to come to terms with, sooner than later)