Ten Foot Bunny said:
Motörhead each and every day of the week. And month. And year. And decades too. Not to mention they have the best vocals out of the four in the poll.
Raw power always wins. Which I guess means Iggy and the Stooges win, but I digress.
EDIT - Welcome to the forums!
I'm not sure if I'd agree that raw power wins over sheer power and range, or that Lemmy has better vocals than Rob Halford or Bruce Dickinson.
Lemmy certainly is the rawest of the three and it suits Motorhead's style down to a T, but I don't think that Motorhead has the better vocals than Judas Priest or Iron Maiden.
After being in the front row of a Motorhead concert in a small venue, I was convinced that I'd never shit solid for the rest of my life, but after seeing Bruce Dickinson at the same small venue... it was something else... I felt like I'd been at ground zero at the wrong end of a giant megaphone as a metal nuke went off.
It's also amusing that Ozzy doesn't even get a mention, as even though I voted for Black Sabbath in the poll, Ozzy's vocals are shit, especially compared to Messrs Halford and Dickinson... although Black Sabbath also featured Ian Gillan and Ronnie James Dio (and Rob Halford briefly) at one time or another, so that really throws a spanner in the works about deciding which band has the best vocals.
Even so, and even excluding Ozzy's vocals, I'd still answer Black Sabbath to the original poll question just for their music (especially their early albums)... although if Deep Purple was also an option and the question was a bit more open, I would be hard pressed to choose.