Judah in my opinion was never a very good welterweight against the better opposition. Judah is actually a pretty small guy and I think his best weight was at 140. Randall on the other hand was taller had a good chin and had pretty good textbook boxing skills. I think Randall beats Judah, stops him in the late rounds with a big straight righthand right down the middle.
The taller, more disciplined, classy Randall hand Judah a beating. "Whilst" less flashy and fast, he would ride out anything that Zab could muster and put a beating on him..set up by his better fundamentals and strength. A stoppage would occur in the 10th.
Makes no sense considering that Chavez fight was at 140, and the Spinks fight was at 147. But anyway, Randall by stoppage.