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Presuming GPS is the one rely on
GPS is terrible for altitude measurement due to geometry, so most Garmin units use a barometer instead. The barometric altimeter on a Garmin is pretty good in general for counting ascent/descent, but it can't measure absolute altitude and is fooled by changing weather, so it attempts to re-zero periodically by GPS.
gbj_tester
Often wondered, after I complete a bike ride, why is the ascent stat recorded on my Garmin always higher than the ascent stat on the same Komoot route?
e.g Today I did a 53 mile loop, Komoot says its 3650ft, Garmin says 4534ft. Why such a disparity?
Presuming - hopefully - that the GPS figure is the one to rely on..?