Froch out of necessity. Andrade has an unbreakable noggin, which he uses to his advantage - basically it is his main defensive weapon.
I would say Andrade. His chin makes Frochs look like a girl but he isn't as stupid to think he can't be hurt so he tried to block shots. He just isn't a fast guy. Andrade Vs Froch would be a good match up. Also if Miranda beats Ward then I would love to see Miranda get a shot at Froch. I think Miranda could KO Froch.
Andrade... and not because I'm dogging Froch; Andrade's learned to roll instead of screw up his elbow worse by blocking. It's his only defense, so it's rather nice that he's so good at it.