I am a tech systems contractor in Minnesota and have installed 14 Ubiquiti UniFi networks ranging from homes to a 60 unit apartment building. I’m designing one now for a 33 room hotel and a possible new coworking space. Two of those UniFi networks involved extensive use of mesh access points. UniFi is an excellent bang for the buck.
Hardwired access points are always superior to mesh-connected access points. The only time to consider mesh instead is when a hardwired option is cost-prohibitive.
There’s a significant quality and performance difference between consumer grade mesh devices (such as “range extenders”) and enterprise equipment. The best mesh access points have two antennas and use one antenna to connect the access points to the network (instead of a hardwired connection) and the other to connect with user devices.
If you need to use mesh devices, the basic UniFi Mesh (UAP-AC-M) for $99 each is an excellent choice. If you have a very large number of wireless devices connecting, then the UAP-AC-M-PRO should be considered for $199 each.
Consider adding a UniFi Gateway ($140 or $345 depending on network size) and UniFi CloudKey ($99) for an excellent user interface for managing the network and monitoring use and quality of service. A tech-oriented person could fairly easy learn how to operate it, but a professional should be seriously considered for initial setup in a business or co-working environment.