With more USB ports, you are able to connect more devices.
A WAN (Wider Area Network) port is most commonly used to connect the router to the Internet. It can also be used to connect to an external private network.
A higher maximum Wi-Fi speed results in better performance. This is measured in megabytes per second.
Asus GX1008B V5
802.11n is a wireless standard released in 2009. It has faster transfer rates and improved security compared to its predecessors - a, b and g.
Apple Airport Time Capsule
More antennas result in increased signal strength. External antennas can be repositioned in order to improve the signal, and replaced with a longer antenna if needed.