Which XFINITY WiFi hotspot service - Use 'xfinitywifi' or 'CafeExpress' or 'XFINITY' network to use?

The XFINITY WiFi by Comcast hotspot service has an app with a Help file that shows a screenshot saying:

You can also select any network listed above the Available Networks option as shown in this example:

Usually all I see is the first item, ‘xfinitywifi’. Oddly, as I hold down the wifi menu the other two items, ‘CafeExpress’ and ’XFINITY’, occasionally pop-up briefly. As shown in that screenshot, only the third has a closed padlock icon.

Questions:

• What is the difference between these items? Is one preferable to the other?
• Why do the second and third pop-up and disappear?
• Does installing the XFINITY WiFi app on my Mac affect this situation?

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