Not a fair or valid comparison - most of his career McCallum was a light middle - Mikes best days were at 154, and Ward is now a light heavy......
Ward. 168 version of McCallum was past it and way past his best weight. McCallum is one of the most underrated boxers in history. He's Top 50 in my ATG rankings.
If we are talking the very best McCallum then it's not that close, McCallum was and still is so underrated. Fighters like Halger gave McCallum a miss, personally I don't think it was out of fear but Hagler knew it would have been a very very difficult night.
Mc Callum never fought at 168. He was at the end of his career at 175 pounds. So Ward wins at 175 pounds.