I used to have two TP link routers (one in bridge mode) and replaced both with one of these. If I move to a bigger place ill just get another one, and have perfect handover between APs.
For the Ubiquiti dont you need to connect it via ethernet? I stay in a rented house and to run ethernet cables across means I need to drill holes, which I wont be allowed to do.
I bought that range extender yesterday, seems to be running ok. I noticed consistent breakups in whatsapp calls when Im on the extenders network. The range is better but speed is up and down. But, wirecutter seems to rate them highly - https://thewirecutter.com/reviews/best-wi-fi-extender/
Must say I have not had great sucsess with the tp-link range extenders I would rather look at another brand. Even the 2k one with the 3 antenna's is pretty bad even with just 15m from the AP speedtest only gives me around 3-4mb/sec vs 30 from the router it self.
Also not sure how they will handle 5-10 clients per extender.I would rather look elsewhere.