I think this would be a pretty good fight, I give Mason the advantage because he has significantly more power and stops Chisora in the late rounds...
I take Mason to win as well. Very good fighter always in Frank Bruno's shadow sadly, only one defeat when Lennox Lewis really busted up his eye. I take Mason to win on points, Mason was good at firing in straight accurate punches, decent power and certainly a tad more ability than Chisora. Shame he died so young.
Yes, it would be a great fight, and one that might depend on judging, I'll go for Chisora though to get it done dirty with volume.
I feel like Mason is too unproven to favor him well over Chisora, he could win, but it's not guaranteed.