Super Smash Bros. Melee v1.02 ISO is considered the "better" or definitive version primarily because it is the tournament standard and the required base for modern competitive mods

: To play Melee online with Slippi , you must use a 1.02 ISO. Slippi provides the rollback netcode necessary for smooth online matchmaking and match replays.

In 1.00, port priority (who gets the grab when two players grab simultaneously) was a coin flip. Version 1.02 standardized the rules: Lower port number wins. This is vital for competitive integrity.