The digital copy is better but you can't test the mods on the 3.55

Ps store version of game requires 3.60 firmware or above to run it...
So if you wanted to make sure the mods work before you data transfer back to online ps3, you can't. you would have to data transfer and see if it works. lol
Disc version = can test on 3.55
***Important if you get the disc version make sure it is only gta4. We can NOT mod the disc with all DLC's on it. Do NOT GET "Episodes from Liberty city"
lol