I think a PC version is more relevant with regard to overlap compared to a version for a handheld console.
The PC gaming experiene is usually far more similar to gaming on a HD console, main differences are usually potential frames rates / resolution (also potential issues), free online play compared to the 360, controller setup (usually worse for co-op if supported on the console, but often better online MP), etc.
A PSP version is usually more like a PS2 quality game intended for on the road. It IMO doesn't really rival high definition gaming, at the home you'll probably prefer to play a PS3 game on your HDTV, that's not an option while being on the road. And of course PSP versions in general aren't direct ports from the PS3, often they are special versions (like the latest MGS PSP isn't MGS4 or LittleBigPlanet).







