Day Trip To Tobago Cays Which Boat

We want to do a day trip to the Tobago Cays. Trying to determine which boat we want to take. We may do the share Charter on the Friendship Rose, but I can't get a good feel for what the seating is like on this boat and how comfortable it will be for a full day. We are considering this or considering doing a private charter on, Gusto or Octopus. Which do you think would be more comfortable for a group of five people as far as seating and lounging for the day also which would be more comfortable as far as the ride and potential seasickness?