Here is my questions
1) How much do you want to spend?
2) How much time do you plan to stay at the resort?
CBR is the cheapest of the 3 and my wife and I really enjoy it, been there 2 times now in Jamaica.
WL is 2nd in cost (all depends on the room tho) my family and I stayed there for 3 nights and enjoyed it, however, being from New England it was too much like home and we enjoyed CBR better.
Poly is the most expensive (I used to stay there as a kid when I was growing up) and if I were spending a lot of time at the resort and had the extra money, I would stay there. I personally would rather spend my money on a few meals instead of staying at the Poly, just to stay at the Poly when we get a wonderfull time from CBR.
My opinions only.