Choices in the poll, but feel free to suggest other awesome games you played. Thanks. :)

Note that I'm a PS Plus subscriber since forever so I have every PS Vita game offered by Plus so far.

Also own a few others such as Ragnarok Odyssey, Street Fighter x Tekken, Sound Shapes, Plants vs, Zombies, etc.

I do not like LittleBigPlanet.

little big planet is an awesome game and i can tell you is better than lbp2 on ps3
sly cooper is another good game
lumines one of the best puzzle games
sonic and all star racing is very good racing game and i think it is better than modnation racer
my last recommendation is Smart as i bought it 4 days ago and i play it everyday

persona 4 golden (the PS2 version is my favorite game of all time)

Wait for DoA5...and don't even think about buying Silent Hill, I haven't read a single positive review about it.

persona 4

Persona 4 will win by a landslide. And it should. Go buy it now.

I just purchased it yesterday based on your advice a couple weeks ago.

I'll play it when I plat'num Ni Nu Kuni the next few days. Ni Nu Kuni was fantastic but I'm disappointed at how... non-challenging it was. I hope Persona 4 kicks my ass.

Yeah, Ni no Kuni is awesome in a lot of ways but it's like one long ass tutorial. Some of the boss fights are pretty neat, though.

Persona 4 on normal is a good challenge if you don't overlevel, and on hard it will rape your shit.

Persona 4 Golden from the list, Gravitry Rush is amazing as well.

If you want to look outside that; there are many good final fantasy titles for the PSP that deserve your attention like FF3 and FF7 Crisis Core.

There are also some good PSOne games on the store you could get (too long a list to name just a few lol)

P4 or Sly 4