I'd give an edge to Wills.I've wondered why this didn't happen,same as I've wondered why Greb never fought Fulton. Klompton probably has the answer.
Wills does not look good on film, and of course there is not film of Greb in the ring. But looking at the records, Wills had 131 fights from March 1916 to October 1925. He only lost twice here and that was via a DQ. I don't think Greb would win, but he could give him a good fight.
The only surviving film of Wills exists of him 35-37 years of age. Not exactly fair to judge Wills based on footage talen at an age where most great heavyweight champions were long retired
