Safariland loaders require the loader and rounds be aligned with the cylinders. The HKS due to the amount of slop does not. While it ht be easier to fudge the HKS I have never felt like it was faster. At one time I could accomplished a 1.5 second shot to shot reload using Safariland Comp 2's,a split six speedloader holder and a 686 from concealment. While not nearly that fast I can still perform a sub three second reload using the same equipment.
Perception of speed is not the same as speed. I would recommend the use of a shot timer to check actual performance.