802.11ac is main stream as well as 802.11n. Because 802.11n has better distance and more power to pass-through wall. But 802.11ac is much fast than 802.11n. 802.11ac Technology Overview: 11n Specification: 2.4 and 5Ghz  Supported Wider channels 40MHz Better modulation 64QAM Additional streams up to 4 streams Beam forming Backwards compatibility, with 11a/b/g 11ac introduces: