First off, can you share your nana?!
Secondly
I would choose the
polly if you like,
Swimming- It has a really nice pool
The Hawaiian Theme- It's everywhere and done very nicely. They even have a nightly luau
Good food- Tonga Toast is legendary (I haven't got the chance to try it yet though...)
I would choose the GF if you like,
Shopping- There seem to be alot more stores than usual here
Turn down service- With a chocolate on your pillow
Oprah-

Not kidding, it's supposed to be her fav place to stay at WDW
They both have the monorail,great views of MK, nice atmosphere, character meals, beaches, you name it, they prolly both got it!
Personally though, I'd go with the Polly.