TA Wendy here.. Of the 3 resorts you have mentioned.
Dreams likely WOULD be the highest in price but is very nice and I love their chapel.. very Mexican/ Spanish feel, really atmospheric and cute. Very nice resort.
Grand Palladium is a huge complex.. lower prices, and I have worked with many couples who chose this resort and never had a complaint about it.. but it is very big. think golf carts to get you from one side to the other. The chapel there is pretty and large.. more traditional looking, not especially Mexican in feel, but very pretty when decorated with flowers and such.
RIU Palace Mexico - This resort is in the Playacar area.. near to 5th Ave in Playa Del Carmen and lots of fun in the area.. it would price out in the middle between the other two most likely. Their chapel is small, or there is a very cute Catholic chapel right at the end of 5th Ave that I have had couples use.. very sweet chapel and makes for a fun little walk down 5th Ave with your guests and everyone sort of trailing behind and cheering.. If you were to use this I recommend hiring mariachis to walk with you as you exit.. very fun!
There is also a GREAT and very unique chapel at Ixcaret park .. it is sort of underground and exceedingly beautiful. Occidental Grand Ixcaret hotel is right there and very much on the lower end price wise.
I hope that is helpful!
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