PC's are actually 2 generations ahead (DX11 vs DX9).
PSP2 and the 3DS will both have plenty of exclusive titles, as both Nintendo and Sony dominate the industry with internal studios. Both Sony and Nintendo have likely (and from reports that've been available for ages are), giving extremely advanced warning to all developers, so their internal and 3rd party devs will have a much better grasp of the internals than what was done, say, with the PS3.
And finally, as far as most consumers who've responded go, nobody gives a crap about 3D, it's just not what people are focusing on currently. That having been said, it's their internal studios that will sell these items. That, and their starting price tag. If Sony can undercut Nintendo, that'll be a good start.
