Since you have stayed at VWL before, the villa rooms are very similar to the hotel as far as decor. I think it will also depend on whether you will have a car or not, as getting anywhere from SSR can be a long trip.
Some pros for VWL:
1. Boat transportation to MK (I know others have complains; but we love it).
2. You can watch the water pageant right from your hotel!
3. Whispering Canyon Cafe & Artist Point (if you like sit-down meals).
4. Quick bus trip to MK and it doesn't share with other resorts.
5. Free valet parking if you are
DVC (oops, and have a rental car).
Cons for VWL:
1. If you get stuck in a villa at the end of the building, you have a long walk wherever you want to go.
2. Rooms are not as "new" as SSR.
Pros for SSR:
1. Easy walk to DTD.
2. Newer resort
3. View of fireworks at DTD (do they still do them, I'm not sure).
We just made the switch from SSR to VWL also. We own at VWL and in our 8 trips we've made so far with DVC, we've never stayed at VWL. We've stayed in the hotel portion several times.
Good luck with your decision!