Managing Calibration Factors

I recently got a question from a Stryder about calibration factors in the Stryd app vs on a Garmin/Coros watch. The calibration factor in the app is independent of that on a watch, so, for example, you could have a calibration of 101.3 on your Garmin and 98.6 in the Stryd app. I suggest using your phone and watch for different kinds of runs (ex: Indoor vs Outdoor), so you don't have to worry about switching a calibration factor back and forth.

Does anyone else have thoughts on this? How do you manage your calibration factor(s)?