Other than temperature I think with the latest update (Garmin Training Status) all of the metrics are recorded/populated by TR now.
I do dual record though. Sometimes its a freeride in Garmin following a TR workout (TR controlling the trainer). Other times however I forgo the TR app and its just its a TR outdoor workout on a virtual course (Edge dual recording a RGT/Zwift session). Or in the case of an Endurance workout instead of having one long interval, I recreate the TR indoor workout which is more stepped an run that on my garmin on a virtual course.
Occasionally its triple recording just to confuse things 
TR controlling the trainer, RGT running for visuals and the Edge recording too as a back up. The Edge is also closer to my face in a TT session