If you're talking exclusively 90s then John LeClair ranks well ahead of Roberts, Clark, Tocchet and probably even Neely.
Depends how much you put weight on fighting skill when ranking classic power forwards. It was an integral part of their job during that era, especially early 90's. Not necessarily the fighting itself, but the aura of intimidation and that attitude of "not taking any crap from anybody" as an old school power forward should be able to handle sometimes even goons and enforcers if necessary.
1. Neely (the best goal scorer, the best hitter and a good, if not an excellent fighter)
2. Shanahan (a very good all-around)
3. Tocchet (a good goal scorer, a very good hitter, an excellent fighter)