I won't be of much help to you, but here goes.
Other than unusual circumstances such as yours, I have never found there to be too terribly much difference between brands of WiFi adapters (within the same class, e.g., Wireless N, Wireless AC [at a given rate], etc.). I have seen micro/nano adapters that get a stronger signal than those with an external antenna or antennas (which is an exception, but there you have it) and, of course, vice versa.
You are not, of course, going to get throughput that is any faster than your router can handle, so if the WiFi speed on that is AC1200 getting a better Wireless AC adapter will not result in any gains in speed on your network since the infrastructure to support such is not present on the router end. Of course, if you're using a laptop, it travels with you, and you know that you connect to networks that use later Wireless AC routers it could be worth it.
For myself, if this is a laptop that travels, at all, I would not consider anything besides a micro adapter in the class you need. If it's for a desktop PC, then looking at an adapter with an external antenna or antennas is likely to give you better chance at getting a stronger and more consistent signal, but even that's not guaranteed.
When you can pick up micro adapters such as this one, and this one, and this one (with antenna) all cost under $15 it's inexpensive enough to experiment with a micro and a "micro with external antenna" to see which suits you best. [I have no affiliation with the website that all of those come from, I've just bought multiple USB WiFi adapters from them over time for myself and others and have not had any issue with any of them.]
Brian AKA Bri the Tech Guy (website in my user profile) - Windows 10 Home, 64-Bit, Version 1809, Build 17763
Travel is fatal to prejudice, bigotry, and narrow-mindedness, and many of our people need it sorely on these accounts. Broad, wholesome, charitable views of men and things cannot be acquired by vegetating in one little corner of the earth all one's lifetime.
~ Mark Twain