I don't know anyone who even approaches the theoretical speed of any 802.11 technology. Your neighbors on the same channel reduce your bandwidth, and neighbors on channels which overlap yours raise the noise floor a lot. I have a Moto X Pure and a Ubiquiti Unifi AP AC Lite, and I should theoretically get 867 mbit/s. I never even approach that in practice, even if I'm in the same room. There are more than 30 available networks nearby when I look on my phone. Even if I achieved the theoretical rate, the bandwidth falls off a cliff once you leave the room, as 5ghz signals are significantly attenuated by walls. I can max out my internet (75 mbit) if I'm in the same room as my AP, but I can't stream 1080p content on the 5ghz if I have 2 walls between me and my AP.

That being said, the Apple APs are the fastest consumer-grade APs out there. If you are going to hit the theoretical maximum, an Apple AP is your best bet. I don't think streaming is where people notice issues with their internet though. In my experience people tend to notice issues in video games, skype, facetime, and other applications where there isn't a buffer to hide issues with dropped packets first.