Both boards use Realtek ALC1150 codec, so the sound should be the same. The wireless isn't a priority, but it's something I would like to have. The SATA Express I would consider future proofing.
The main problem is that I want this rig to be able to last. My last rig, the one I'm still using (Q6600 and Asus P5K+some random ram), is close to 6 years old. So I don't really want to cheap out on the motherboard.
For me the breaking point between these two boards is better overclock ability vs. more features.
Tbh, I would have liked to go for a X99 board and a 5820k, but it seems that it's beyond my reach, as the DDR4 ram prices are going to be severe.