Generally speaking the disc size wouldn't affect how many songs you could have since your average Guitar Hero "Fret file" wouldn't be beyond a few megabytes. Most of the information will be graphical stuff. But yes, I will most likely get GH3 for the Wii rather than my aging PS2. Those who lack the foresight to understand how awesome the concept of a wireless Guitar Hero controller is should seek help...but that's just my opinion.