For 802.11n, choose something with the ath9k driver. For 802.11ac, there's unfortunately nothing with an open firmware, but it seems ath10k and mt76 receive the

For 802.11n, choose something with the ath9k driver. For 802.11ac, there's unfortunately nothing with an open firmware, but it seems ath10k and mt76 receive the most attention by developers working on bufferbloat reduction etc. For 802.11ax, not sure there's anything available in the openwrt or mainline kernels yet. You might end up with something with a binary blob and you can't upgrade your kernel.