St. Thomas Ferry to Tortola

Looking for advice on which ferry to take from St. Thomas to Tortola. We need to get to Sunsail. Should we purchase in advance for a Saturday trip. Thanks,

Take the first one going to Road Town and NEVER< EVER buy a roundtrip. Buying in advance or RT ties you to one ferry company of the three or 4 including InterIsland that you may use. Also buying in advance is not guarantee you'll get on board if it fills up..no assigned seating!

just in case you didn't read Manpot: NEVER< EVER buy a roundtrip.

Don’t buy in advance ever. Show up, buy tickets for the next boat and go. It’s less than a 15 minute cab from STT