Matthews, still. Not because he isn't a great player, but because he simply has been hyped too much over the years, both by fans and by media (where Toronto has a massive thing to say), which had a great interest in talking into existence a rivalry that has never been there. They always wanted their new era Crosby vs Ovechkin-narrative but didn't consider that there are at least three more forwards who could have a word to say.
Matthews is considered to be a great player due to his goal-scoring. A quality that completely evaporates once the games begin to have a meaning. And there is nothing left underneath that makes him more than just a good player otherwise, in contrast to Draisaitl, Kucherov or MacKinnon.
He is a fantastic player, no doubt. But clearly at least one tier below where influential people consider him to be.