If I had to pick between the two (I picked ASRock for my Intel build, sorry!), I'd go with Asus for the best-in-class UEFI and DTS encoding support. I'd expect them to be roughly equal in just about everything else.
Canon 6D|24-105/4L |70-300/4-5.6 IS USM|50/1.4 USM|50/2.5 CM|50/1.8 STM|85/1.8 USM|Samyang/Bower 14/2.8|24/2.8 IS|Sigma 150-600 | C
Canon EOS-M|11-22 IS|22/2|EF-M 18-55