I did GF for our honeymoon and it was beautiful but a bit formal. The Poly is much more relaxed. After running around and the "semi-formal" affairs involved with the wedding- I prefer a more relaxed environment. That being said - we got engaged in Hawaii so as you can see that is more our style.
Either way- you cant go wrong- even though I prefer the Poly - the GF is still a wonderful place to stay.