If you can, go for PCI-E. Asus have a Wireless AC card, which is well regarded.
http://usbwirelessadaptersnow.com/asus-pce-ac66-ac1750-review/
USB-wise, go for the Edimax, as it uses USB 3.0, eliminating the adapter as a bottleneck
http://usbwirelessadaptersnow.com/edimax-ew-7822uac-review/