This is nothing to do with the AP, and everything to do with the available airtime in the RF spectrum. If you want the best performance, disable 2.4Ghz to increase available airtime.
Assuming you have good clear WiFi channels then some tips ...
10 to 15 users per AP will give you excellent performance.
15 to 30 users per AP will give you good performance.
30 to 50 low volume users per AP will work but throughput will be low. Forget about using video.
50 to 127 users - will work but will be absolutely horrible. People won't want to use the WiFi. But if all you care about is how many people can connect - then you can use these numbers. To stand any kind of chance, you will have to insist on users only having the latest devices with support for the latest WiFi standards and you will 100% have to disable 2.4Ghz.