Ford GT using torsion bars

The main reason people swap out torsion bars for coilovers is to create clearance for headers. It makes no sense for handling purposes. A spring is a spring. They are just packaged differently. Of course, one other advantage of the Mopar torsion bar is that it transfers the load into the unibody at the floor near the firewall, which is much stronger than at the inner fender, where the shock is anchored. That's another reason they are used in race cars.