Of the three Eubank wins due to the head to head meetings, though as wwatt said, Benn did accomplish more. IMO Eubank was the most talented, but he did have a tendency to be lazy, and come down to his opponents level, even before the Watson tragedy.
RJJ at his best would have beaten them all, probably stopping Benn and Watson. However IMO out of all the guys RJJ fought in the 90s Eubank would have given him more problems than any, except possibly a late 90s version of B hop.