I would only get a game in PC-format if there is no console equivalent (i.e. WII/PS3), my brother does it the other way around.
My reason is that PC versions tend to have more flexibility than their console-counterparts, as well as some game vendors releasing genuine creation/mod toolkits after the initial release. The thing is that with a PC, there's the issues of fluctuating frame-rates whereas consoles don't suffer this as much, if not at all.
