No contest. Sabbath all the way. Sabbath created heavy metal, and for that I will always be grateful to them. Also, when did Plant ever bite the head off a bat? Not you, Batty, I hasten to add.
Seriously, what is this that stands before me vs there's a lady who's sure all that glitters is gold: which are you gonna pick? Pipers in hedges or devils standing at the bottom of your bed? And let's not forget the mini maestro, RJD RIP.