Charles. Hopkins was old and wouldn´t be able to go a high pace. And Charles simply was the better fighter. Now prime Hopkins against a young Charles at mw would have been a different kettle of fish.
yes but while i think hopkins would give a better account, the middleweight charles (who defeated charley burley) was still a physical dynamo by all accounts. slightly green but still significantly better than hopkins in almost all areas. hopkins knew some tricks though and could snatch victory from a young, middleweight charles at 175, it is barely competitive. charles UD in the area of 12-3
Lt hvy was Charles' best class. MW was Hopkins' best class. Do the math, Charles wins in a technical fight for the purists. Maybe even a beatdown as Charles was a monster at light heavyweight.