Black Sabbath all the way. The run they had with Ozzy is one of the best in music, and their first four albums are damn near flawless.
I like a lot of Ozzy's solo career, and I really don't listen to a ton of Heaven & Hell. I have the first album while they were still known as Black Sabbath, but Dio has a great voice. I like Holy Diver and his work with Rainbow a lot more than I do Heaven & Hell, though.
The song "Heaven and Hell" is sick, though.
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