The basic difference between WiFi Plus and WiFi is how often waves are emitted. Although, in the first place, is important to know what WiFi technology is about.
WiFi connection consists of a wireless network, which connects different devices. This is done through the emission of radio waves that the receivers interpret and transform into information. Thus, we can have internet on computers, tablets, mobile phones…
The router is the terminal that emits the waves in the frequencies of the different types of network. The most up-to-date ones already have both possibilities. First ones only had the capacity to emit in the WiFi frequency range.
Like all wave signals, the emission occurs at certain frequencies. In the case of WiFi, the frequency used is normally 2.4 GHz. This frequency band can be a problem when there are many connections. For example, in a block of neighbours with many nearby devices.
Because of this, the emergence of a new frequency band could be a solution to this saturation problem.
WiFi Plus (also known as WiFi+) works at 5GHz, which makes the downloading speed increases. On the other hand, its range is lower. That is why, both connections are usually established. With less speed and greater reach we find the WiFi network, and Wifi Plus has higher speed and a shorter range.
Eventually, WiFi Plus can support more than 20 devices without interferences, while the 2.4GHz connection cannot even support 5. This is because the first one sends data through several channels at the same time. Furthermore, other devices also work at 2.4GHz and they can add some noise to this connection (for example, the microwave).
So, if you can choose, remember that for high speed (video calls, for example) it is better to use WiFi+. But if you need to get away from the router and stay connected keep the 2.4GHz WiFi network.