I used my Withings Steel HR watch. It’s not a full-fledged Smart Watch. But it does monitor heart rate (hence the HR), and in conjunction with my iPhone, does GPS. Now, my Strava app is not able to directly link with the Withings watch. However, I can link the Withings Health Mate app to the Strava app. As a result, I get both apps posting my run online!
There is one irritating aspect of the Health mate app – it doesn’t seem to track my heart rate. And yet, the Strava app had my heart rate information. It really doesn’t matter all that much. Strava has a better website that gives me HTML code for posting my map. Withings doesn’t appear to do so.