I think in depends on the table. As a kid (18 in NY) playing in bars on coin-op it was always 8 on the break wins. No one knew what nine ball was, much less 9/6. Because of the tight tables 6.5' you could combo off anything but the eight. An OB carom off the eight was good.
The only call you had to make was the eight. Depending on the bar, if you missed the pocket on the eight you lost. Others you lost your turn.
I would practice in a pool hall near home in NJ. Nobody played eight or nine ball that I ever saw. It was straight pool only. I could never hang with any of those players, holy smokes they called every freakin' shot on a nine foot table!
Now in my advanced age I have a 9' Gold Crown and a 6.5 Valley in the basement. Call shot eight ball on the big table and bar rules on the little one. But since it's so congested mostly it's 9 ball because the coin-op is disconnected. I keep the magnetic cue ball on the table as a training plan so I'm familiar with the feel. Ya never know.