Originally Posted by neilpeartjr.
Well, in the interest of common sense, Metallica has sold alot more records and has had much more success than Dio-era Sabbath. Even if you exclude everything after "Justice."
There is no common sense that you are comparing a one single element with part of another entity. Let's say Black Sabbath and Metallica are two independent entities but what you are doing is partitioning Black Sabbath into different entities, what is not clear is what criteria are you using, replacement of singer? replacement of any individual that belonged to the band? If you do that to Sabbath, you should do that to Metallica as well.
It is just a matter of plain statistics.