We have been to Aruba five times and always stay at the Marriott Aruba Surf Club. We do go to the Stellaris Casino and Hotel (3 buildings away on the same beach) to gamble some and to go to their great restaurants. The beach there is great!
On the other hand, the Renaissance is in town--very busy area--with almost no beachfront for sitting, sunning, etc. Although we have not personally stayed there, a guest by the pool at the Surf Club told me that she and her spouse had done so and was very disappointed. Partly because the room was not nice, but also because there was no easy beach access.
Lots to do on Palm Beach where the Marriotts are located, plus easy walking distance to many, many other resorts with excellent dining choices and excursions--like sunset cruises. Oh, and the dinner on the beach in front of the Marriott will make you think you're in heaven! Awesome, at Simply Fish!