Froch. DeGale would pose Froch problems early doors, but DeGale had an awful habit of taking rounds off, which would allow Froch back into it. How much Froch wins by would depend on how seriously he takes DeGale. If he takes him seriously and sticks to his game plan then he wins by a wide margin and maybe even stops DeGale. If he takes him lightly, like he did Groves in their first fight, and boxers stupidly, he wins a close decision in a scrappy fight.
Froch did struggle against technical fighters and Degale would have given Froch problems early on in the fight. However Degale didnt have the cardio to keep up the pace and Froch would pile on the pressure from the 6th round onwards and he would ko degale late
Unlike Dirrell and Ward, DeGale was easier to hit. Especially when sitting on the ropes, as he always did .