I've stayed at Coco (last year) and Merrills 3 (when it was Negril Relax but run by Merrill's) a couple of years ago.
Hands down, Coco!! Merrills is all inclusive if that is what they want - but Coco has a much better property and with the
frig in the rooms you can probably eat and drink cheaper. Also, a better part of the beach in my opinion.