What does his current hardware not do right now that you wish it did? Are you having performance issues? Ubiquiti will probably work well enough but those questions might narrow things down some.
Personally I use a
APU single board computer running pfSense + a
D-Link DAP-2695 AP at home. I got fed up with the lack of reliability of even the more expensive consumer routers and decided that splitting everything up into separate components would be best. So far everything's worked pretty well except when I've gone and screwed stuff up on the router while "optimizing".
BTW, if you go with pfSense, enabling CODEL shaping on both WAN and LAN interfaces will likely be all you need QoS-wise. I've yet to cause latency issues when using up all of my bandwidth with this setup.