I drew a little hardware comparison for Sony, Nintendo, and Apple.
If I could buy any game on any of these platforms, I would pick the PSP2 every time.
So, what it will really come down to is software exclusivity I suppose. I am getting the 3DS for Nintendo exclusives, and the PSP2 for exclusives and multiplatform games.
I will not be purchasing Ipod because it lacks both compelling hardware and software.