I'm 13 and stayed at the Polynesian for the first time in early November. I loved it! My mom, who is a big Hawaii fan herself, couldn't get over how much the resort truly did resemble the real thing. I would not hesitate to stay there again. The location, atmosphere, service, food (Kona Cafe- yum yum), smells, etc. all made it a terrific stay. I also couldn't believe how spacious our room was (in Tokelau) when we switched from the WL. Of course, everyone has opposing views, so it is natural that not everyone love the Polynesian! Personally, my favorite resort is the BC because of childhood memories of being there all the time- it's my mom's favorite resort. We are also big fans of Nantucket, so we loved the theming. Therefore, the YC seems like a good choice to me too. However, the Polynesian could be a better resort for you, so definitely stay there! I know you will love it regardless of whether it turns out to be your favorite resort or not. Enjoy your trip!
~mariamouse~