[Pitchwife]

Short answer: The Prof didn't say, so we don't know.

Long answer:
We have examples, and from the First Age too, of Edain besting Elves in physical combat (Túor/Maeglin, Túrin/Saeros), so I'd say the two kindreds were roughly equal in strength. As for the Noldor, we'd probably have to distinguish between those born and nourished in the Undying Lands and later generations, and Rog, being chief of a house, would very likely be Aman-born; but I think the difference would be more one of spiritual, less of physical strength.

Now, imagining Rog as kind of a Muhammad Ali or Arnold Schwarzenegger among the Firstborn, he would, in my personal subjective unsubstantiated opinion, probably surpass even the great heroes of Men, but still be somehow within the same order of magnitude.

The more interesting question to me is: Why do you need to know? If you're writing a fan fic or running a DnD campaign that somehow revolves around, say, pitting Túor against Rog in a wrestling match or some other sports contest in Gondolin, I'd say go with whatever makes most sense for the story you're trying to tell, and damn the stats. Pure strength isn't all, skill and stamina can change a lot.