How do I determine the best mode of operation for my sensor?

Determining whether to use POLL Mode or NON-POLL Mode is purely a persons preference.  If you want that extra piece of mind to know that you are in range and if you want to periodically check for a possible missed alarm it is recommended to use POLL Mode.  POLL Mode also gives you the ability to turn on the White LED for use as a flashlight.

If you are primarily concerned about battery life and only want to receive alarms then NON-POLL Mode is your best option.