I've always used AB-Gold mount. Typically it seems like rental houses carry those rather than V-mount.
But my question is what you you guys as Steadicam Ops typically run into using? I see a lot of sleds in the market place being sold that are V-mount and it just got me curious because Every rental house I've rented from ((Able Cine, Adorama, (ID) Illumination Dynamics,)) all seem to rent out Gold-Mount for Alexa's, Amira's, REDs.