No dog in any of these fights these days since has been a couple years since had a boat in charter and now have a private day boat on VG a. My two cents ..could be worth less..I'd go with the BVI boats first time round. Worst seas many experience comes from in Pillsbury Sound between ST and ST John. Not a great start for newbies. In addition most of the better BVI companies are minutes away via a chase boat in the channel..and Jost. If having a problem on a short vacation you want it remedied quickly...for 9 years I saw the statements..and paid them for a BVi based charter co. You don't want to hear.."try this and if doesn't work..call us back" . You want to hear.."the chase boat is on the way..from Roadtown , nanny cay etc.". No customs involved..usually quick resolution.
Anyway that's my take..a while back some talked about charter guests making repairs and dealing with spare parts on board etc. IMO that is not a great idea for guest or boat owner. have a great trip