With notable exceptions, today's top games are built for Xbox 360, PS3 and PC, and unless you can't live without the likes of Mario, Solid Snake or Master Chief, you'll likely pick based on the controller you prefer, graphical fidelity, and the distance you sit from your screen.
Do you identify yourself as a PC gamer? Or do you prefer consoles, perhaps? Truth be told, there's not a lot separating the two these days.