I would take the dolphin, with the money you saved over the Poly price you could do meals or extra shopping etc. If you are getting sick of the Dolphin, since you have stayed there alot , then go for the Poly, that is a really good price. We just stayed there. The only drawback if you booked the dolphin is you cant charge to the room, which you know and you cant get the meal plan. If you want the starwood points etc. then take the dolphin again. If you have young kids and will spend alot of time in the magic kingdom the transportation alone is worth it for rest, breaks, etc. and the Polynesian has great childrens activities etc. Good luck deciding.