If you already own the DC version, it's probably not wise to get the GC version. There are a few more side quests and things in the GC version and the graphics are slightly better, but not worth buying it all over again unless you are a HUGE fan. If you don't own either, and you know where you can get both for roughly the same price, than go with the GC version. If the GC version is more than $10 more, than get the DC version.