Interesting - a far more polished singer, Dio. it’s less rock ‘n’ roll though, isn’t it?
From the album’s Wiki page:
In an interview with Songfacts, former Osbourne guitarist Zakk Wylde of Black Label Society dismisses the idea of the Dio-era being authentic Sabbath: “You listen to Black Sabbath with Ronnie James Dio in it, and it’s not Black Sabbath. They should have just called it Heaven & Hell right from the beginning. Because you listen to that Heaven and Hell album, that doesn’t sound anything close to Black Sabbath. I mean, that sounds about as much like Black Sabbath as Blizzard of Ozz sounds like Black Sabbath. If you were to play Black Sabbath for me – and I’m a huge Sabbath freako – and then with Father Dio over there, I’d be going, ‘Oh, cool, what band is this? This is good stuff.’ I mean, the songs don’t even sound Black Sabbath-y. I mean, ‘Neon Knights’, could you picture Ozzy singing over that song?”