PSP took a few years but ended with an amazing library. Best Hand Held EVER.
Vita I LOVE it. Not much in library yet but Sony in all it's systems starts off slow in games. PSP now has a fucking great library. Gravity rush is the best game it has now. Give the vita time. Also Vita is a great mini tablet. I been having fun with it before my games arrived. I give it another year before the library picks up.