My first instinct is to vote for Chuck Billy.....which is what I did. Not many talk about his voice much, but he really has a great vocal range and excellent vocal control for a baritone...a gravelly baritone. Plus, I happen to like Testament best out of the listed bands.
For me the honorable mention is Hetfield. He is also a baritone, but not when he first started, his voice was very uncontrolled and more like screachy screams.