I haven't used either but I don't know why it would matter if you were renting from a DVC member and staying in a Villa (that sounds like what you're talking about), a DVC member staying in a Villa, or a regular guest staying at any of the resorts....Why would they care? Honestly I'm not trying to be snide.... I just wouldn't understand why it would matter. Besides, they are not Disney employees so if you don't tell them your not a DVC member how would they know? And again, why would they care? You might also do a search or ask on the DVC board as well and find out from people who have actually used the service. I guess it just never crossed my mind that it would matter to them is all, lol.
I do know that the Disney kids clubs for children 4-12 can be used by any guest, and you don't have to be staying at the particular resort to use their club.