The battle of current, former and former Royal Hunt vocalists. I know Boals did a bit with , Yngvie and Erik Norlander as well, but outside of that, I don't know much about his work (quick wiki reveals he's a vocal whore... I do know The Codex, and his work last year on Free Fall). I like his two albums with Royal Hunt (Paradox 2 and X), but DC is truly a vocal gem. Silent Force rocks my world.
Cooper for my tastes. Really need to check his solo album out completely.