As a follow on to hummer's note, the balancing act is more than a single component, and it's not all equal all the time.
The balance of your car is affected not only by the sway bars, but springs, shocks and tires. Then, you have to consider what you are trying to do and where you are trying to do it.
First, your tires have to stay on the pavement, and to do that, you have to have some reasonable degree of softness to your over all suspension - our day to day driving is not on the super smooth surface of the new F1 tracks.
Then, you have to determine where you need to improve the handling - corner entry, corner exit, neutral throttle cornering, high speed or low speed corners???? My car will occasionally lift the inside front tire coming off / full power on of turns 5 and 7 at Road Atlanta with a little bit of understeer - which would lead you to think I need to either adjust the rebound of the front shocks and / or stiffen the rear bar. However, I absolutly do not want my car to over steer in either of those corners, and my car is extrememly neutral in turns 1, 4, the esses, and turn 12 which are the smoother fast parts of the track. So, over all I am very pleased with the balance of the car and have made no adjustments to compensate for the generally irrelevant understeer off of 5 & 7.
However, that is not to say that my car is set up firm enough for the track - I am getting way too much roll, but to take it to the next level will make it too uncomfortable on the street, and I'm not willing to spend the $$$ for double adjustable shocks so I can adjust the rebound independently of the damping.
All that said, for street use, most of you just want to limit body roll because it feels more responsive which it will be - however, there are very few occasions on the street (I hope) that you will get to the limits of adhesion and actually have to deal with the inherant understeer of your car, nor is it a good idea to purposely create a car that oversteers as a natural road going characteristic.