Sony's history in the handheld market is short, but notable. They have had two handhelds so far, and with each, they've managed to make a fair few mistakes, although they have also successfully managed to compete with Nintendo in a market where no one else has done it before.
With that said, which one of them do you like the more?
On the one hand, the original PSP, although having a fair few issues over the years, ended as one of my favorite systems of last gen, and a system I hold in the highest regard. The games that it had were absolutely amazing, and it, along with the DS, contributed to the resurgence of handheld gaming. The PSP was that rare handheld that managed to rally both Japanese and western devs behind it (although at different times in its life), and it had so many great media features too. It was ahead of its time. That's not to even mention the games! Burnout Legends, Crisis Core: Final Fantasy VII, Metal Gear Solid: Peace Walker, Grand Theft Auto: Liberty City Stories, God of War: Chains of Olympus, Ridge Racer, Tekken: Dark Resurrection, Monster Hunter Freedom Unite, Kingdom Hearts Birth By Sleep, Dissidia: Final Fantasy, Tactics Ogre, Breath of Fire, Persona 3 Portable. It was great, it had so many neat titles, and it was, in many ways, the true successor to the GBA.
On the other hand, the PS Vita has Persona 4 Golden.
Damn it, this is tough to pick.