I don't know if I can pick apart the great and glorious gods and goddesses of singing to that extent. We all have our personal favorites. I'll just draw your attention to the fact there are thousands more excellent singers who never have been or ever were recorded, and our window into this fascinating activity is of necessity limited to what we can procure.
Many of our less fortunate colleagues who were spurned for: race, religion, looks ( of all things), or other personalia all add up to our collective loss.
A case-in-point: the late great Birgit Nilsson once told a story about a contemporary of hers, a woman who was not created in the image of media beauty, but who could sing.
Nilsson said that she wished she could sing as well as her colleague. As a matter of fact Nilsson was chosen for a lead role, because she was the "pretty one". ( I'll get back to you with the other soprano's name, I don't have it at finger tips) but think, if the other soprano had sung, would we have heard of Nilsson? think of how many other stories of the people who have jumped into deep water for an ailing colleague, and built their career from there.
One more thought- the baritone Thomas Quasthoff. He knows he doesn't belong on the operatic stage, and my hat is off to him for all of his vocal qualities, as well as his courage in overcoming his handicap. He sets the bar very high for the rest of us, indeed.
I leave you to your favorites, with the request that you continue to keep your ears open for all the folks that have put in the time and training to try and achieve their dreams.
Tschüss,
Lynn