But then I deployed lots of boxes with WiFi, that had to work in remote locations where others depended on it. I'm ashamed to say I just shipped the first couple with the Intel cards provided by manufacturer.
But after getting a lot of complaints I actually tested it. Which is to say I purchased all the makes and models of 10 WiFi mPCI cards I could find on eBay, collected as many random access points as I could and lots of laptops (over 50), put them all into a room and tested the network to collapse.
Intel's cards were the most expensive, and also the worst performing. They collapsed at around 13 laptops. The best 801.11ac cards were Atheros (now owned by Qualcomm), and they were also the cheapest. Broadcomm were about the middle, but I had the most driver problems with them.
My pre-conceived but untested notions were shattered.