5G vs 2.4 Ghz
5G is meant for stationary devices close to the modem. This would include standard devices that stay put like an Xbox, desktop computer, home security system or baby monitor.
The other network stream (a.k.a. the 2.4 gigahertz stream) is best to connect to devices that move around your home. This would include cellphones, laptops, tablets and other mobile internet using devices.
The 2.4 GHz stream is a little slower than the 5G stream. However, the 2.4 GHz stream actually has a larger reach or radius around the modem than the 5G stream, which makes it a more reliable connection.