Depends on eras that Chalky.. for examples:

AC/DC - Bon vs Brian
Sabbath - Ozzy vs Dio
Deep Purple - Gillan vs Coverdale vs Gillan
(Talking mainstream, yes Gillan was in Sabbath for a short time l know & Rod Evan’s etc excluded)…

As in the 80’s
Brian
Dio
Gillan

Ac/dc is Angus & Brian, the rest could me anyone for me…