We just returned from Aruba last week. We stopped by the new Westin Casino and personally liked the old casino much better. Also on our Casino agenda was Marriott Stellaris Casino. There was a big bingo game going on during the day when we stopped by with many, many locals playing. It was extremely difficult to get a parking spot outside. You could hardly get near a slot machine. We stayed at the Divi Beach resort and noticed the parking lot of Alhambra Casino is in the process of being enlarged. We did not go into the Alhambra Casino in the evening but it did look like they were going through a renovation. I do hope management of Alhambra adds better ventilation because it is so smokey inside the Casino and not fair to the non smokers. We not visit Crystal Casino this trip, but have had some good luck there during other visits to Aruba. We have not been to Hyatt's Casino in a few years but did like that Casino very much when we did visit.
We stay at the Marriott Surf Club so the Stellaris is convenient but I like the Hyatt (live music while you lose ) and the Riu has a decent casino too. The Alhambra is always fun but is now under renovation. The only casino we really disliked is at the Holiday Inn as it looked like it hadn't been cleaned in a long time.