Well, the Wii version is all kiddie-fied. The PC version has no multiplayer. So that comes down to the Xbox 360 and PS3 versions, right? Joystiq details the mounting case that the PS3 version is clearly inferior, with a rather daming comment from Ghostbusters developer Terminal Reality:

For the record, the PS3 version [of Ghostbusters] is softer due to the 'quincunx' antialiasing filter and the fact we render at about 75% the resolution of the 360 version. So you cannot directly compare a screen shot of one to the other unless you scale them properly. The PS3 does have less available RAM than the 360 - but we managed to squeeze 3 out of 4 textures as full size on the PS3.

Joystiq pours a little salt in the wound by pointing out that the publisher of the game in Europe, as well as the owner of the Ghostbusters franchise, is none other than Sony.