Hard to call. Chambers is infinitely the better boxer, but he hasn't got the power to keep Arreola from coming in. I would like to say Chambers UD, but the chances of an Arreola late KO aren't to be ignored.
Chambers would lump him up the way he did Rossy. Arreola is better than Rossy so he would not get stopped but he'd lose by UD.
I would back Eddie. I think the Povetkin loss was as much to do with what he did wrong as Povetkin did right, and Povetkin's a good boxer anyway. So long as he keeps his concentration, he can take advantage of Arreola being a slow mover and box his ears for the wide decision. If Arreola comes in blubbery again, even easier.