This isn't a difficult choice at all.
GFR has a small, cult-like following, but to my knowledge (though I am sure XFear will correct me on this, which is fine since I am admitting ignorance here) they are not a popular mainstream "rock legends" kind of band.
Meatloaf, on the other hand, IS an absolute legend and is someone who could surprise a lot of people in this tournament. His early work in the 70's still resonates on radio today, such albums as "Bat Out Of Hell" still sell well in many stores. "2 out of 3 Ain't Bad" is fantastic, and of course "Paradise by the Dashboard Light," which is a definitive wedding anthem.
After a slight "hiatus" from the mainstream, Meatloaf roared back in the 90's with "Bat Out Of Hell 2," best known for the mega-hit single "I Would Do Anything For Love." Unbeknownst to some, though, is the fact that B.O.O.H.2 contained better longs that that, such as "Life is a Lemon and I Want My Money Back," "Rock and Roll Dreams Come Through," and "Out of the Frying Pan and Into the Fire." His songs were as long and epic as their titles, and his concerts matched.
Meatloaf wins this one in a stomp.