I started with Marriott because it offered some many locations and I was thrilled 25 years ago and still enjoy their locations. Next visited Hilton at Kona and had to own it and was impressed with units in Europe and Honor points for visits to European Hotels. Then visited Hyatt Carmel and Sedona and found that Hyatt has more exclusive and less commercial locations.
My experience is they compare in the order above and I recommend if you want to buy more than one, buy Westin, then Marriott, then Hilton, and then Hyatt but it really depends on where you live and where you want to vacation.
Sorry about surprising you with Westin, but it is really a cut above. Caveat on buying Marriott you cannot go wrong on Ebay for a Desert Springs for $1600 if the m.f. is paid by seller, and closing costs paid by seller, so it really and actually is a $1 acquisition, and even if you live on the East Coast or Canada.A two bedroom lock off gets you two weeks in a lot of locations. You can't join the Destination club but that is all right. I once met a women at the Marriott Aruba that said I own here in Aruba and I would travel no other location and own no other T.S.. I kept my mouth shut, I don't want to always vacation at the same exact location and own one TS and I don't want to one multiply TS within just one trading company. Too each his own.