To the OP - it's really dependent on what you feel the car is doing. What works for me and my driving style might not work for you and yours. The sway bar and minimize body roll on turn in - but so can your driving style by turning in earlier and slower. It's all about setting your car up for you.
As people said earlier - yes a sway bar can solve some understeer issues. Usually the issues that it solves are issues caused by body roll and the tire rolling over onto its outside edges.
In a properly set up car (camber plates, suspension, etc), this may not hold true - where adding a front sway would most likely cause more understeer.