Just a thought from someone who thought just like you. We took the Wonder land/sea package four years ago and stayed at the POLY for the land portion. We were already booking an extra day and decided to save some money by staying at the All Sports the first night since we were getting in so late. It was a huge mistake. The check-in process was loooong and tiring. There were no bell services for our luggage, that had to be trecked a long way to our room. The room was very small, stuffy, and noisy. We wasted our whole first morning, which could have been spent at the parks, moving to the new location. Remember, the hotel will move your luggage, but not you. That meant two buses to get to the POLY, another registration line (although , thankfully, more efficient), a wait for your luggage, and another wait for your room to be ready. We will never do that again. It might have been only one night, but it was the start of our holiday and a sour one at that.
Lucy's Mom