The question is: Does the Mazda3 handle better than an Impreza with a 19mm RSB?
My stock VW TDI handled better than my stock Impreza Sport, but that was no longer true after I upgraded the Impreza's RSB to 19mm.
Actually, let me clarify. The stock TDI cornered flatter than the stock Impreza with the 16mm RSB. But the Impreza with the 19mm RSB corners flatter than the stock TDI. However, even with the 16mm RSB, the Impreza had more traction than the TDI when cornering, especially when the road surface was less than perfectly smooth. On bumpy roads, the TDI's rear end felt like it was getting loose, whereas the Impreza stayed more planted even before the RSB upgrade.