Having stayed at both, I much prefer Country Country to CCLP. CCLP lacks character in my eyes, leans toward a more "mature" crowd, and has too many rooms for my taste. Country Country has added more rooms, though I did not notice a huge change compared to days past. You will get some noise from Margaritaville on occasion, however my biggest noise gripe there is from the kitchen in the morning. So ask for a room that is not next to the restaurant. I am also a fan of the included breakfast, which is quite good with a pot of coffee included. Both are in decent locations on the beach.
As far as Dream weekend, I have stayed on the beach during Dream and both places will be close to normal as a lot of the Dream folks stay elsewhere. Traffic at night will suck, so keep this in mind when deciding to go out at night. A good workaround is to take a boat up to the West End for dinner/sunset, and take a cab back to the beach. If traffic is too crazy, get out and walk back to your hotel.