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andyp-
Remind me again who owns the ANT+ protocol?
Ah yes good point. Well, I did start by saying I knew nothing about it! It's hardly the only part of the internet suggesting that though, including Wahoo reviews (despite the acceptance that BT is better technically, as you said). I will have to try it again myself (I don't think it was even a valid option when I first attempted it)..
Rod_Munch
I know nothing about this, and do still get an average of one 1sec drop per hour using my £9 ANT+ dongle that's stuck to my downtube (dunno if that's good or bad?) - but FWIW this is what I read from Garmin when I was looking into it..
https://forums.garmin.com/sports-fitness/cycling/f/edge-830/166164/connecting-your-sensors-best-practices
Garmin recommends always using the ANT+ connection on a sensor if it is available with your Garmin device. The profiles are more mature, often have more features, and there are no customer facing benefits to using the BLE connection unless that is the only option for the sensor to be connected. We are continuing to make improvements to prioritize ANT+ connections in the sensor search UI (User Interface) to better support customers in making this choice.
In-short, unless there is a good reason to pair over BLE such as data content or signal strength then the recommendation is to pair over ANT.