In my opinion, I prefer the Atlantic side. For a few reasons....but the most important is that the trade winds keep the bugs away! I also found the Atlantic to be warmer than the Caribbean. Everyone has their opinion but that's my two cents for you!
Rent a car and drive around to different beaches...it's the best way to see the island!
We haven't stayed at the Blue Haven but from what we've heard it sounds fabulous.
Have a great vacation and can't wait to hear your views when you return! Please keep us all posted.