@ianholmes9000 , using Suunto App with Ambit3 makes sense only if you don’t want to change settings and reconfigure workouts too often - it syncs nicely in the background, something that was quite rare for me with Movescount, and syncs to Strava with same ascent values you see on a watch, something that was broken in Movescount for a long time, probably still is.
But for routes and settings and workout builder you still need Movescount app. Both apps can be used on the same phone, but it takes a bit of care.
I’m using Ambit3 and Suunto App runs in the background, hardly ever use it for something else but syncing. And I sync to Movescount maybe once a week. Or when I need to change workouts.