Thank you so much for all of your advice and tips! This task of picking a location is so daunting, especially since the FI has only been to one Palace resort ages ago. Thank you so much for your input, I can't wait to make the big decision.
I have never been to Moon Palace, but I have heard GREAT things!! I believe Moon Palace is designed just like ASP -- it is pretty big, has like 7 restaurants and has a full service spa!! I would definitely say that Moon Palace has a lot more to offer than Playacar.
Playacar was beautiful, but after going there for a day from ASP, I was definitely glad I chose where I did. We were not impressed by Playacars food or restaurant selection, and it didn't seem like they had much in terms of activities? Although they have a beautiful beach and it has direct access to the town of Playa del Carmen, Moon Palace is a lot closer to excursions, and you can also visit the other cancun palace resorts (sun and beach palace) fairly easily. Moon Palace is also 30-40 min. closer to the airport, which would make for easier travel to and from.
If it were my choice, I would hands down pick Moon Palace. I feel like they would make for a better wedding and vacation location in the end.
I used tripadvisor.com to read reviews, as do a lot of the brides on here. Hopefully that will help you?