I believe that if you are using ANT+ that multiple devices can read it at the same time where BT once paired can only be seen by one device. @gpl made a video describing this https://youtu.be/gQlaB9k82OA
I hope I am understanding it correctly. Perhaps he will correct me if I am wrong. One downside could be double reporting of a workout to services like Strava though so something to be aware of.
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