The Priest version on Unleashed in the East is just so much better than the studio version. It’s almost incomparable. The studio version is just a little too slow and plodding. It’s too bad they didn’t let loose more on Rocka Rolla and Sad Wings; but I understand they were following in Sabbaths footsteps and sound. That would be why I’ve only been a casual fan of Ozzy era Sabbath; the doomy, slow, plodding sound has never really been my thing. And in regards to Metallica, since they have released TBA, I can’t imagine they have played many shows in which they haven’t played both Master and Sandman. Very few shows I would guess. So Master just had a four year start. But going back to Priest, I say for sure listen to the live version. But overall I think Maiden is the best choice here.