I disagree.
Nylander's shooting and scoring ability is far superior to Marner.
Nylander's ability to thread the needle and find the target is nearly on the same level.
Nylander's vision and playmaking ability is nowhere near Marner, very few in the NHL are.
Top end, with ideal linemates, I can seem one being a 25-30 goal and 70-80 assist guy, and the other a 35-40 goal and 50-60 assist player.
Overall, Marner is the better player, but strictly offensively, they're not (at their very best) all that far apart.