To handle bufferbloat (too large buffers without queue management causing long latencies) pick a router based on ath9k, ath10k, or mt76 wifi chips. Those are not the most common ones, and might take a slight amount of effort to match what's available in your local gear store, the above chips, and the openwrt table of supported hardware at https://openwrt.org/toh/views/toh_extended_all

(Personally I have an ath10k based ZyXEL NBG6817 (product name is "Armor Z2") which I'm happy with. But it was a few years ago I bought it, don't know if it's still on the market. Also still running the previous openwrt 21.02, haven't yet upgraded.)