The PS3 system itself has the same processor in all 3 models; so the gameplay will be the same. If you just plan on buying the physical game at the store, then you would be fine with one of the lower capacity hard drives. However, If you plan on downloading a lot of games, demos, movies, music and/or photos to your PS3 system hard drive, then you probably want to go with the largest hard drive available; which is the 500gb.