I have all the DBZ movies on DVD lol
Anyway, so KKx3 Goku has an advantage on Wheelo but it's not that big since KKx4 Kamehameha didn't do all that much damage to him, in the end they needed spirit bomb.
Anyway, the chain in that movie seems to be.
KKx3 Goku > Wheelo > Rage Gohan > KK Goku > Base Goku = Piccolo > Bio Fighters > Roshi > Gohan and Krillin.
Wheelo also no sold a combined Kamahameha from Roshi, Krillin and Goku which is pretty cool.