I am using edge 830 and Fenix 5 X and has tried using then both for the same Traning. I am using true up, and both devices are syncing to the same account (and uses the same settings). I sync both devices before my Traning.
But after the Traning the Fenix reports:
Traning effect :3.8/2.0
Recovery time: 32 hours
Edge:
Traning effect :4.7/2.0
Recovery time: 3 days
All other data is equals.
This is a little confusing.