I have stayed at all of them except Shadow Ridge and Enclaves but I did tour Shadow Ridge.
DSV1 2BR is the largest, like 1600 sq ft. The studio while does not have a full kitchen, is spacious and has a separate walk in shower in addition to the tub. The downside is that it has 2 separate beds in the studio. The 1BR and studio are separated by a locked off hallway and it makes it great for 2 couples travelling together, with gives each couple their privacy. My favorite is DSV1 simply because it is large and very luxurious. It has free spa access to JW Marriott on Mon-Fri although I have never used it. I also love JW Marriott restaurants which are superior to Westin Mission Hills restaurants, in taste, freshness and variety. JW Marriott has a gondola that takes you to restaurants and a ride there and back to the main hotel is fun to do.
DSV2 is a regular 2BR lockoff, smaller and less luxurious than DSV1. Studio has 1 bed (Queen) and very small, with shower over tub - has a hotel room feel but still nice. No fireplace. No free access to JW Marriott spa. This is probably my second choice because again, the affiliation to JW Marriott is huge for us. We eat out 2 meals a day and having the convenience and discount is nice. It is a long walk or you can take a shuttle to JW Marriott.
The golf courses at Desert Springs are quite poorly maintained and I won't play there again.
WMH 2BR is bright and open, and very standard "Westin" in its feel. The exterior look of the buildings are quite "ugly", in my opinion. Shuttles run all day to take you around the property and to the hotel. WMH hotel restaurants are really not great, surprisingly. The room layout and restaurant access probably makes it my third choice. I have not played at the golf courses here but will do so when I stay there next year.
WDW 2BR is darker but still nice. The exterior is very pretty and architecture is modern. It has a lone restaurant with very limited menu. Food is OK. Desert Willows golf courses are quite nice. This is my 4th choice due to the limited restaurant choices but the concierge here is superior to the above 3. So I may make it my 3rd choice, I am not sure at this point.