It is difficult to switch back & forth on a daily basis - both games may suffer as a result.
But bar box play and reg 9ft tables are
2 DIFFERENT GAMES. On a bar box, the different cue balls (mud ball, red dot, blue dot) etc. all behave differently. Strategy is very different, with balls close together, and very small targets for shape. Combos, caroms, kicks and banks rule. When in doubt, middle of the table will usually give you some kind of shot. You will use follow more than draw, and will probably fine tune your stun and run-stun strokes.
On a 9-footer, you have 16 additional square feet of real estate. As a result, strategy and patterns are different. Clusters are not as common, and moving whitey 18+ feet for shape is not uncommon. This would almost never happen on a bar box.
Anyways, point being that the 2 games are very different, with different shot selections and strategem for each venue.
When I leved in Atlanta, I learned to switch between the 2. No choice really, as there is loads of bar box action throughout the mid-south, esp GA, TN, AL. Here on the west coast, you have to really search for a bar box. I kinda miss having quarters lined up down the rail and owning the table for hours (oops, sorry, I'm awake now).
-von