The biggest difference I see between the BVI charter and a USVI oriented charter is that most of the anchorages do not have beach bars,restaurants, dinghy docks or facilities that are expected in the BVI sailing world.
It is not a daily bar stop atmosphere in the USVI - it is a daily swim, snorkel, beach or shore hike and sunset cocktails and great dinners aboard!
***In a quiet anchorage with no rowdy late night dinghy traffic!
More boat time - underway and moored -- less bar, restaurant time ashore