I'm gonna be a killjoy on this one.
It's impossible to compare players from different eras as so much changes so quickly these days. People will rightly point out people like Artie and Mal R as tough players but you just don't know how they would have fared in the modern game where players are so much fitter and TV cameras etc.. are everywhere.
For me, anybody that gets on a rugby pitch and then comes back to do it all again the week after is pretty dang tough.