Altimeter "Continuous" Auto Calibrate During Activity

New run

Altimeter calibration "at start" only. Better...25m vs 12m from suunto
Both watches calibrated at the begining.
Guess something is a bit wrong the garmin algo.

https://ibb.co/Y7WtRSx
Any news if we are going to see some improvement?

These watches aren't laboratory instruments, they're going to have various amounts of error.  In this case it simply appears that Suunto likely applies a bit stronger filtering to their algorithm, so it doesn't accumulate as many small altitude deviations as you run compared to the Garmin.  In this application stronger filtering would be a benefit, but if you were changing altitude more rapidly that filtering would be a negative, so its a design tradeoff.  In a 6k run the altitude may change a little here and there, but the altitude reading will bounce around a little even if you're not actually changing altitude, so all those little changes get accumulated.  The only way to prevent that is to filter them out, which may be what the Suunto is doing a bit better than the Garmin.  The amount of filtering is going to be fixed in the watch, so if you changed elevation more rapidly, its possible it would report less accurate results in that scenario.  Given the small amount of change in elevation, this seems like a mostly academic discussion anyway.