I would take the shorter one. Two reasons, first depending on when you go, it is extremely hot at the ruins. These ruins are not ones you can climb on so the shorter tour should quench your history thirst just fine. Secondly, unless the longer one includes time on the beach just below the ruins, it will probably take you to a Tanzanite store as part of the tour. Not a real good place to shop in my opinion. I did enjoy the ruins and hope you and your family will as well.