What would be the best portable system for Kingdom Hearts the 3ds or psp

I would have to go with the PSP, only because it's very similar to Kingdom Hearts' original platform of course.
A Nintendo Handheld has a different feel to the regular PlayStation Kingdom Hearts experience, because of different controls. And whilst a 3DS could push graphics for portable systems to the limits, I would say the PSP would bit just a little superior.

That being said, the 3DS isn't even out yet. And with the new "Joystick" thing added to it, it could provide easier gameplay and a better feel. It's all 50-50 until the 3DS is actually released and tested...