Use identical Wi-Fi names for both 2.4GHz and 5GHz bands.
Use identical Wi-Fi names for both 2.4GHz and 5GHz bands.
I noticed a change in your Netgear 810s when switching from 2.4GHz to 5GHz via the built-in interface—your SSID now includes "-5G." In the settings, select dual-band Wi-Fi and both channels should appear together. Currently, there are no issues on your devices, but for optimal performance, it's best to choose a clear, unique SSID name that reflects your network setup.
It shouldn't matter. Some WIFI gear includes a setting that delays or ignores the initial tries to connect to 2,4GHz. This might make 5GHz seem more appealing compared to a device. However, if this isn't true, the choice depends on the device itself. Using separate SSIDs would lock your devices to one frequency, which is better. I'd recommend sticking with the same SSID unless you encounter problems, then create different ones.