Sorry, but comparing the two varios mentioned in the original post:

When flying through turbulence that nets neither up nor down and not worth circling in, ever wonder what it is? A mechanical or old school vario won't soon display anything useful about the change in airmass horizontal vector..
Correction, a mechanical vario will never tell you about it.

Today's flight was in wind from SE then NW then SW then SE then NW then SW then S then SW then SE then SW then NW. When approaching convergence lines the wind change was indicated on the Air-Glide S before the airmasses converged, by showing velocity reduction then change of direction then - on both mentioned varios - up indication.
Jim