Happy to report that the dual speed+cadence Duotrap sensor works very well with my Samsung S7 (android 6.0.1). Auto connect is very fast. No clashes with my Polar HR monitor that I have experienced with my Wahoo dual sensor.
The Trek duotrap is a very neat and tidy device. Built in to the chain stay.
I have a shiny new Samsung S7 which has, apparently, ant+ hardware:
https://www.thisisant.com/directory/galaxy-s7/
But I don't have Duotap yet (or the shiny new bike it will be attached to :), hence my question.
So, given a choice, should I connect via ant+ or BLE?
Is it possible to be connect to one device via ant+ and another via BLE at the same time? Ideally, I would like to get some sort of power meter (with Left-Right pedal balance) fitted to my shiny new bike.