I still play RotS. I like very much this addon. It is more stable and has less issues than Legends 18.104.22.168 (current official patch). Legends is not mature yet (beta patches in progress), but will be surely in the following weeks. It is an ambitious addon with very nice additions.
I have no time myself to test beta patches. Thanks to the community. I prefer using stable versions to play. Who still plays RotS for this reason ? Do you prefer RotS 22.214.171.124 or Legends 126.96.36.199 ?
What others have said; 188.8.131.52 is quite damn stable considering it's a "beta" patch. I don't honestly even remember when I had a clear crash in the Legends. Also, what Ashbery said. The borders make the game much more sensible, be the SoIs "realistic" or not.