who and why, cuz there are many explanations... to me, Tony Martin recorded the better albun as a Black Sabbath singer... i'm not talking about the best play from BS, but i wanna know the best vocal work
Ozzy without a doubt. He's not technically a brilliant singer, but his voice and performances on (especially) the earlier albums are amazing, and perfectly capture the essence of the music.
Difficult choice between Dio and Ozzy. Dio is an amazing singer no doubt, but Ozzy has always been the main name for the band, his voice contributed well to their style of music back in the day.
I'll vote Ozzy, he fits the band perfectly.
I vote Ozzy, although he has been useless for the last 20 odd years. Nowadays Dio craps all over him, obviously.