Remember how much Dan struggled with the platforming in the hidden box/spike room where as Patrick got all but one of the blocks on his first attempt and only died because he attempted/almost made a difficult jump Dan didn't see due to not finding that one block.
If it's just straight platforming then Tricky has Dan beat. Dan choked so hard on platforming when it came to his last upload run. Dan thinking he's better than Patrick at platforming is the same Dunning-Kruger effect that makes him think he can wrestle a wolf.
I have watched every second of Patrick's Mario Maker streams and he constantly dies in dumb dumb ways, in the latest for example he managed to die to the starting Koopa and Goomba 3 times..
Pat's isn't as good as Dan when it comes to the pure skill required in perfect platforming. Pat's advantage is he doesn't go on tilt as much as Dan does and tries different techniques.
In a one-on-one live tournament type competition it'd be a toss up as I think as Dan gets super taught and lets the pressure get to him. (Just check out how tense and anxious he was during the upload runs, dude actually got out of breath)
In a day long 'who can finish this first' type of contest where they're both at home left to their own devices, Dan would win hands down I think.