Between Hyatt and Westin, I'd choose Hyatt - don't think the westin gets really good reviews. If the location of the westin is better for you, perhaps consider the Sheraton across from the westin. I've been to both the Hyatt and Sheraton (as Hyatt diamond and SPG platinum) and find them close to being equal. Sheraton doesn't have a lounge but gives (at least used to) breakfast in the restaurant buffet and evening drink in one of the bar / lounge.