Watson outboxes him. Far more skilled, too high a workrate, and Eubank hail mary uppercut aside, he had a good chin.
There is nothing Froch does better than Watson. He doesn't punch harder, he doesn't have a stamina edge (Watson was a 12 round fighter himself), he doesn't have faster hands, he doesn't move better or block punches better and he is no bigger or stronger - Watson shoved Eubanks around like a ragdoll in their second fight. Watson, therefore, wins and he wins by late stoppage. MTF