Answer:
802.11n, but read explanation.
Step-by-step explanation:
802.11n is faster because it supports 5GHz but also 2.4GHz. I don't know much about routers and networks, but as far as I know, 5GHz routers cover small area but since it supports 2.4GHz too, that should he superior to the 802.11g by any means. Though, once again, I don't know much about networks and routers.