PSP vs PSVita: Which is better?

[Terminator]

If I'm correct, I think the 5s has a 64 bit processor.. which is the most powerful mobile processor today so yes per core its probably twice as fast.. vita does what it does though as the code is optimised by Sony..

edit: until the new iPhone gets jailbreak we won't see how well ppsspp performs unfortunately

You're right about PPSSPP not running on it... but you can get it working on iOS without a jailbreak. But no Dynarec JIT can be used... but if you don't mind.. you can actually install PPSSPP on iPhone 5s without a Jailbreak.