Urban Breed is pretty good, strong range, but I think he's a B+ player and we're looking for As and higher here. But if we have no As, I'd go with him, for sure, in this group.
Phil Lynott is obviously a legend, but his voice is ideally suited for Thin Lizzy. How's he going to sound over Alex Lifeson, Geddy Lee, and Tony Iommi? He's got the husky part of vocals down, but I want more from my Best Band Ever singer. B-.
John Bush, I've listened to some Anthrax and some Armored Saint casually, but never paid attention too much. He's got some power, yeah. I'm not the biggest fan of the top of his range, but it's pretty good. This is a tough one, but I'm gonna say A-.
David Byron, actually gets a little nostalgia vote for me, as my dad loves Uriah Heep. But overall, he's in the same vocal range as Phil Lynott. B-.
So it's Bush.