Bon Scott
DLR
Ozzie, but both Ozzie and Dio made their best career decisions when they left Black Sabbath.
I do prefer Brian Johnson. I think Bon has a nasal voice and there music was not quite there yet. Back in Black has got to be one the greatest recording ever.
DLR or Sammy that is a tough one. David Lee Roth was at one time a prolific front man with a crazy dynamic voice. But his ego got the best of him. Once Sammy joined the band the music changed a bit.
In an interview with DLR in 89, he states “ Sammy has to go out every night and play my songs, I don’t ever have to sing his songs” Ouch! But the very next month Sammy was quoted saying “ Well Dave, I am going out singing your songs and making way more money singing your songs than you are” Ouch again.
Ozzie rules no matter what band backs him up.
I don’t know were I would be without Black Sabbath in my life.