I couldn't care less that Marner is in a funk, that doesn't bother me at all. My concern with Marner is the the bigger the games get, the worse he plays. Nylander may "go back to being Nylander" but Marner always been the same regular season whiz kid who fades when the pressure's on.
I've said it many times - I'll judge everyone mostly on how they play in the playoffs. Maybe this is the year Marner finally figures out how to play big in the biggest moments you never know. I'm not optimistic though as I see no reason to think that this year will be different somehow, we'll see.
I take Nylander over Marner at this point. There's no guarantees about how the future plays out but as of today, Marner is the obvious choice, at least for me.