I know this is going to horrify some, but I think it's John Tomlinson (with Hotter a close second). Hotter can be very nasal at times in those Bayreuth Ring and I find that annoying.
There may be technically better voices than Hotter, but no other I have heard can so fully render the complex emotion character of Wotan/Wanderer, his doubts and torments are wonderfully expressed.........I feel like it's Schorr, Hotter, and then everyone else. Ferdinand Frantz, John Tomlinson, Donald Mcintyre probably deserve spots in the poll tho.
Bonetan there can be only one answer with your avatar, HH......