Keni The VSS 2 is very close to CW's Sound Stage. It even has the same multiple instance that SS had. It does not have the ability to make your own room.
So far Tverb is sounding very good. It has a "real" quality to it that makes it seem better than the above one. Now I have not tried the VSS 2 as it should be used with a large orchestra and an instance on each track.
I will at some point test it out fully. In the end I think because each is a good unique reverb not something that any reverb can do its worth getting both if one can. For now the Tverb is on sale. That makes it a priority. The VSS 2 can wait awhile. Heck I knew about it when it was in version 1. It can wait a little longer.