Different approaches for different applications, I've experimented with both as I'm sure you have.
For those interested in the theory behind it all, the papers in the spring and damper section found here ( http://www.optimumg.com/technical/technical-papers/) goes into a little more depth, but the approach is sound.
1- Determine target undamped freq.
2- Determine spring rate to reach this.
3- Use swaybars to set balance and/or remove remaining [undesirable] roll.
-R.