Sundin was just a big man who took up the appropriate space befitting his size, went the 200 feet going where he needed to and didn't hesitate to go through anyone, drive into traffic and those who got in his way felt it. He threw a hit here and there but obviously was no Lindros. Think of the way Leon Draisaitl takes up space or Mikko Rantanen battles in the corner. Defensively, the entire Dead Puck Era was more conservative, so it's hard to make the argument that Sundin was some defensive slob in an era when the game itself was not offensively oriented. I wouldn't say he was a Selke guy though.
Matthews dabbles in hitting, but I don't think that's really a core part of his game. He can truck anyone any time, but begs the question, why does it happen so infrequently?
Offensively, Sundin had his early career peak in 1993 before the league moved into a more defensively oriented league. 114 points with a young run and gun core in Quebec, that's still higher than anything our current core has ever managed. Of course Matthews is a better offensive player but Mats deserves the respect here too.