I've only stayed at VWL and BWV, so I didn't vote. But I'll chime in with those who think that housekeeping is not particularly better at one place than another.
I always thought that the DVC resorts that share with a main resort (BCV, BWV, VWL) caused some problems with the housekeeping because they had to run two different systems....one for daily cleaning at the resorts and one for the intermittent cleaning and T&T at the DVC villas. I don't know that VWL, for instance, has a dedicated cleaning staff that only works on VWL rooms. I don't know for sure, but it would seem more efficient to apply the cleaning labor across the entire complex.
For what it's worth...we've not had any problems with room cleaning in our three stays.