I have only stayed at the Riu Yucatan and that was my first trip to PDC. I liked it - the beach was lovely - although I did not spend all that much time at the resort and I haven't been to Riu Playacar.
I can tell you that the food at Yucatan was good, the drinks were nice, and the staff was incredibly friendly. I had no problems there at all.
The good thing with the Riu's is that you may use the facilities at the other Riu hotels. I.E. if you are staying at the Yucatan, you could go for dinner or to the bar, pool, disco, entertainment, et cetera at the Playacar.
Enjoy your trip - if it is your first trip to PDC - I'll warn you .... you will fall in love with the place no matter where you stay!
