Posters to the Forum represent a small percentage of the estimated
userbase.
Polls in the Forum generally get a tiny number of responses.
Judging by the update statistics, (all we have), Tor users represent
about 20% of the userbase.
I dont recall survey results showing any relevant data.
Qubes does indeed provide privacy features, but also includes Whonix
integration for those for whom privacy is their core focus.