SSR will have 536 units when completed. BWV has 532 unit plus the additional 372 Inn rooms. You'll probably notice that SSR feels quiet in comparison.
There is a walkway to DTD and a ferry boat as well. If you don't have a car and want to resort hop for any dining, SSR is great because there are two transport hubs at DTD where you can catch a bus to any resort, and the busses back to DTD run later than theme park busses.
You can request a unit close to DTD access.