I'd choose Adventure. Much more interesting ports for just getting off the ship and wondering around. Labadee, Cococay and Puerto Plata trump the convenience of easier port. However, 8 nights instead of 6 is a really big temptation too. I don't think either decision will be a bad one. I've been been on Adventure or her sisters quite a few times and love that ship. I'd lean towards Adventure but the travel convenience of a Baltimore departure is hard for me to weigh.