She had numerour reasons, including, but not limited to:
1. She thought Disney was a much better company,
2. At one point she was an interior designer for Marriot, working directly on designing their rooms, and yet before that she had done independent contracting with Disney (the Candy Cauldron in DD? All hers), so knew the quality that went into Disney,
3. Having seen firsthand all sorts of vacation plan options, she thought Disney's was by far the most creative, and
4. She thought 30 years down the road Disney properties had a much better chance of standing the test of time (again, she's both an architect and interior designer so she thinks that way).
All of that, plus more that I can't recall in the moment, was persuasive for us.
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We own both Disney and Marriott, plus several others, and to me, the most critical aspects of vacation ownership include: access (availability when making reservations), the magnitude and vastness of the network, children's programs, flexibility, service, reliabilty, and value. Way beyond that I'd put the structural integrity of the resort's buildings. Not to suggest that that is not important, but its just not at the top of my list of "vacation ownership" concerns, which focus more on deriving pleasure, than being concerned about the tiny incrimental share of "real estate that we own (probably about the size of a plot in a cemetery, if you attempt to figure out how large the "real estate interest" is that you really own). After all, I'd trust Disney and Marriott's construction standards way more than most residential homebuilders.
I suspect there are those who believe that their timeshare purchase is an investment of some sort, and those (like me) who believe that they have taken disposable income and purchased something that will bring them many years of enjoyment, even if it does not offer the return that residential real estate does. In looking back on the "value" that we have derived from more than ten years of
DVC and Marriott ownership, we can easily demonstrate a two or three time return on our purchases (and many more years of enjoyment ahead).
Finally, I was told that those who are involved in the design of Marriott Hotels are in an entirely seperate entity than those in Marriott's timeshare division.
Getting back to the Original Poster's question, I believe that both our Disney and Marriott ownerships are very fine products. They both fit our needs. They both offer different, complimentary options. Our Disney membership gets us access to Disney resorts within the parks, the very reason, and sole reason why we purchased at DVC. Our Marriott ownership gives us access to a vast network of very fine resorts, and the Marriott points program gives us access to "travel packages" which we have used to get air for two and hotel certificates, and to stay in Five Star hotels all over the world that we would have never otherwise paid to stay at. Our Marriott ownership would not give us the reliable access to DVC resorts that we want, and our Disney ownership would not give us access to the Marriott and Renaiisance Hotels using Marriott Rewards points, which we value, not the Marriott priority which we especially enjoy to Marriott Vacation Club resorts. As I indicated earlier, in terms of value, the vacations that we have enjoyed from both our Disney and Marriott ownership have exceeded - - several times over -- what we paid for them, and continue to pay to own both - - and, we have equity that we would have never otherwise had if we paid the going rate at Disney and Marriott resorts.
My recommendation, (1) assess your needs and desires, (2) evaluate both programs carefully, and (3) talk with owners of both, to see if your particular needs may be met.
Good luck!