somewhen last year, one of the Marriott-Holdings (if I am correct one of those where the original Marriott family holds only a minority stake) did buy a (majority?) stake in Ritz - and then they (Marriott) started to include some of the Ritz in their Reward program. Some is still better then none. More/All would be the best (for us).
I guess which ones depends on if they own or just run/license (?).