If you had to choose PS4 emulation for: PS1, PS2 or PS3, which one?

[JRPGfan]

The x86 cpu is powerfull enough to emulate PS1 & PS2 via brute force, like the pc emulators.

Just give the PS4 a quick and easy Emulator app.
Done.

Being able to play Persona 1,2,3,4,5 on the PS4 would be pretty epic.