I myself did a lot of exercising during the last 1 1/2 years using an apple watch for measures and I would also go with the previous comment:
Even thought the VO2max is not accurate (especially not compared to actually lab data) it is a nice graph with a tendency which REALLY helps.
High differences might come from different estimation techniques and thus this value is not comparable among different brands but it seems to be for your own value and progress.
During a lazier time it depleted a bit, now its going up again.
Most other graphs don't show it that nice. E.g. your avg hearth rate will not make huge changes (and drop which, even if its good, doesn't feel that good).
Edit: I actually did a Lab test (not VO2max) but an exercise ecg with lactate measurements. I couldn't choose between running and cycling. The problem is: if you choose the bike they can measure the values while you continue riding. If you choose running you have to stop now and then while they take a blood sample. Even there it isn't 100% accurate and might yield different results based on the used method.
Even thought the VO2max is not accurate (especially not compared to actually lab data) it is a nice graph with a tendency which REALLY helps.
High differences might come from different estimation techniques and thus this value is not comparable among different brands but it seems to be for your own value and progress.
During a lazier time it depleted a bit, now its going up again.
Most other graphs don't show it that nice. E.g. your avg hearth rate will not make huge changes (and drop which, even if its good, doesn't feel that good).
Edit: I actually did a Lab test (not VO2max) but an exercise ecg with lactate measurements. I couldn't choose between running and cycling. The problem is: if you choose the bike they can measure the values while you continue riding. If you choose running you have to stop now and then while they take a blood sample. Even there it isn't 100% accurate and might yield different results based on the used method.