The best replacement for 11n is 11ac.

The best alternatives to 11n are rated as following:
★★★★★  11ac
★★★★  11g wireless
★★★★  11g
★★★★  11a
★★★  11bgn
★★  11bgn mixed
★  11b/g
★  11g faster
★  802 11g
  802 11ac

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Speaking about 11n, one probably shouldn't forget about 11g.

Other search terms related to 11n and their ratings are:
★★★★★ 11g
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11n
11ac
11g wireless