Airrouter Type

I went to the Flytec website (www.flyteccomputers.com) to buy some new airrouters. When I searched for them, two hits came back, one called a "US" version:

http://flyteccomputers.com/product/20799/Ubiquiti-AirRouter-US-80211gn-SOHO-Wireless-Router-4-port-USB-150Mbps-100m-AirOS

and the other had no mention of being a US version:

http://flyteccomputers.com/product/670/Ubiquiti-AirRouter-80211gn-SOHO-Wireless-Router-4-port-USB-150Mbps-100m-AirOS

What is the difference between them? But, more importantly, is one better than the other for AREDN use?

73, Mark