I'm not sure it matters which design is more accurate; which pistol do you shoot better with? What pistol fits your hand well and allows you to be the most consistent with each shot and works well with the ammo you've selected. I've had a PX4 and Stoeger Cougar....the PX4 was very accurate for me but the Cougar was the worst I've shot even off of a bench rest. I doubt it was a design flaw....just a stinker of the assembly line. Neither one could match the accuracy of my Hi powers though (for me).