When I was young almost every band played Showmen and I can't remember ever seeing a Marshall.
We judged how successful a band was by their amps,
A poor band played Custom's with the tuck and roll carnival ride seat vinyl.
A band that was a little more successful played Fender Showman. If they were really doing well they had two cabs per amp.
A band making money, or at least having rich parents, played Vox Super Beatles.
The first time I can remember seeing a Marshall live Hendrix was playing it. Fenders blew away Marshall in these part at least into the 70's. Showmen ruled.