Zakk Wylde (for me) will always be the guitar player of Ozzy. Of course Randy Rhoads will always be "The" guitarist at Ozzy's. But Zakk was a good second. He had gone trough a lot of changes over the years. But you will alway recognize his specific guitar sound with the harmonics and stuff :)
As a young skinny guitargod at Ozzy :) . You can scroll to 3.40 for this amazing solo... (although I love the whole song).
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Black Label Society (BLS) is his own band. The music is heavy guitar-hard straight metal/rock. With some great solo work. Shows of BLS are known for their rough musicminded audience. He has a whole line of clothing which makes you think of a motor gang type a life.
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Acoustic he is also a great musican with his dark southern voice In the early days with Ozzy he did not really sang. But I like his dark voice a lot.
Check him out, he is very diverse and a great musican.
Have a great night,
Peter