Couples Ocho Rios had a 30 Million dollar make-over in 2009 and the name changed to Couples Tower Isle. I've been to CTI, but not COR. From reports of guests who have been to both, the resorts still has all of its old charm it just now how a sleek South Beach decor to it.
As for which resort to go to, I can't suggest one since you didn't say what you are looking for in a vacation destination. If you give us a little more information we might be able to help you out.
As far as cities to go to, Couples does not own a resort in Montego Bay.
Juliann & Jeff
Jamaica Soon Come