Legacy SPG properties (esp. some of the great LCs and StRs in Europe/Asia/OUS generally) are definitely worth the special effort.
YMMV on Hyatt pricing - have a couple work trips where I'm utilizing the Prive 3rd night free benefit, makes both an Andaz and Unbound fairly affordable.
IF I wasn't LTT I may have more incentive to stay at Marriotts...but when Marriott is semi-ignoring or not honoring elite benefits across the board, Hyatt meets my travel needs (US/Globally), and the benefits are second to none...easy choice IMO.