Really, you need to try both HKS and Safariland and see what works for YOU best. They aren't that expensive, so you could get one of each and try them out, then buy more of the one you like.
But, which ever you decide on, also pickup some Bianchi Speed Strips, or similar product. They hold the cartridges in a much more easily carried manner. Slower, yes, but as you second or third reload, they are much easier to carry.