I think the posts so far truly nail the issues.
I am like you laloglz in that Marriott is my "other" program. The Platinum Marriott desk vastly outstrips the Diamond Desk when it comes to service. Suites come my way far more often at Marriott properties. Marriott's high end brand properties are superior to Hilton's. Conversely, HGI is light years ahead of Courtyard, and Hampton Inns have no real equivalent brand in the Marriott family.
I am still struggling for an alternative to HH following the devaluation--but that is not a critical issue for the next 2 or so years as I am getting close to lifetime Marriott Platinum, so I may as well focus almost all of my business in Marriott's direction.
Having read boatloads of FT posts--I have to agree that Hyatt's GP program rocks. Now if only Hyatt had (more) properties where I need to be....