Hard to tell as Neither have faced genuine world class operators to give us a true picture of where they are at. If I had to I'd probably go with Crocker if he can land on Benn.
I keep seeing that Crocker is a big puncher, yet 11 from 22 doesn’t suggest that to me. He won his first 6 fights by stoppage and then only 5 from the last 16 when his opposition would obviously be better.
Styles make fights and it depends what style Crocker uses. If he fights Benn like he did first time v Donovan then Benn would have a chance. A more cagey approach like last night and he would probably beat Benn. I am certain that Donovan would beat Benn as he would jab his head off.