Rear suspension kinematics--parallel 4 link vs offset 3 link?

[formula]

I've been thinking along the same lines. The car is a BIG MAMMA JAMMA so I'm gonna focus on maximizing handling as we're gonna need all the help we can get to get this thing around a road course. I'm trying to think of it in terms of heim-jointed links to make sure that I'm not relying on bushing bind to control the axle under loads (I won't be using heim joints on the finished product, though--just a thought experiment). I guess it's time to just dig into solidworks, build a 4 link, and then yank a link and see what the results are.