I tried listening to Maduk a few times, can't get into it, can't bare his mixes, so I'd say Dawn Wall all the way..
Also for me while they seem to fall under the liquid genre, I don't feel like their music is the same kind really. I'd set aside people like Maduk and Netsky from artists like Hybrid Minds, LSB, Technimatic or Dawn wall.
Definitely not the best comparison. Dawn Wall are making some seriously good music at the moment, but i still feel they need a couple more releases till they really cement their sound. However I have always liked Maduk, being brought up through the liquicity camp his music has more of a 'fun' sound (only way i can really think of putting it) as someone said earlier more Monstercat ish (Not that thats bad). While Dawn Wall have a more technical deep sound. Would not say one is better than other as it really depends what you like and opinions will differ.