A lockoff will give you a queen bed and a double sofa sleeper in the second bedroom with a separate exit door and a kitchenette. A dedicated would give you 2 queens in the second bedroom, no second exit, no kitchenette. If the family in the second bedroom has young kids going to bed early (assuming the parents would be in the living room spending time), would they be more comfortable with a room that does not have it's own exit? On the other hand, would the second family like having their own small kitchen area?