Which WiFi is faster?

I'm curious to know, which WiFi network offers the fastest speeds? Is it the one with the strongest signal strength or perhaps the one that's connected to a high-speed internet service? Could it be that certain devices are more compatible with certain WiFi standards, thus affecting their overall speed? Or does the number of devices connected to a network have an impact on the speed of individual connections? I'm eager to learn more about the factors that determine the speed of a WiFi network and how to optimize it for the best performance.