Objectively tho as far as bbing...imo, Simon wins. Never seen a back pic of groink. Simons has a lot of mass on his back(lats, traps, glutes) and is shredded as fuck.
Bbing is won from the backside imo.
Still, groink will always be THEE arm don. No one can touch him in that category. He's in a class of his own.