Froch wins
The worst opponent for Froch stylistically would be someone like a 168 pound Mayweather, a fast elusive fighter who's not there to be hit. Dirrell's not as good as Mayweather obviously but they did show some stylistic similarities. Bute's a great fighter but stylistically he doesn't give Froch as many problems.
And Andre berto is Hatiain, his passport and citizenship says otherwise. Like the US, Canadians are from other places.
Bute doesn't even have canadian citizenship.
If you take away Taylor(who seems lost in translation now nad when Froch fought him) Bute's level of competition is somewhat better.
Resumes don't fightt for them anyway,Froch is just tailor made for Bute.