Laps, splits, heart rate, cadence and running power all travel differently between devices. A practical look at what survives the export.
Every GPS watch records more than it shows you. The file it produces contains lap markers, per-second samples and, on newer models, running power and dynamics.
Lap markers are the important part for interval work. If you press lap on every rep and every recovery, the structure of the session survives the export perfectly and any analysis tool can rebuild it.
Auto-detected intervals are convenient but imperfect, especially on a 200 m indoor track where GPS distance drifts. On the track, trust the lap button and the timer over satellite distance.
Heart rate from the wrist lags behind fast efforts by several seconds. For rep work, a chest strap gives you a curve you can actually interpret.
Running power varies by manufacturer and is not comparable across brands. Use it as an internal trend, never as an absolute number to compare with training partners.