I have heard GREAT things about the Renaissance in Southern Portugal and also nice things about the Marriott in Northern Portugal, both as world class resorts. It mostly depends whether you would prefer Beach and Spa (plus scuba and golf too) or Beach and Golf. However, keep in mind, it will also depend on when you finally decide to take your trip. If you decide to go in March, then I would definitely choose the Ren, since it is in extreme southern Portugal, about 250 miles south of the Marriott, and it will be that much warmer. It will be much less of an issue in mid to late April, when it will be much warmer overall.