Operation Uranus: Opinions on play, version, etc.

[Landser34]

Been looking at this battle.  Questions:

1. Which version (scenario) is the most competitive/entertaining? 
2. Is the SS rescue scenario good or just a German "walk in the park"?
3. What about the "retreat" scenario?

I'm excited to game this battle, but don't want to start a game that isn't competitive.

Played the campaign a few times if your playing Germans in my opinion you will want the SS or the Russians will win hands down.