My impressions with preference for HKS:
Safariland, load rounds, hold under a table
edge and press, twist upward. Locks quickly.
HKS, no more wobble with the newer
models in .38/357; easier to load.
Safariland, takes a lot of pressure against
the cylinder to release.
HKS, must hold or stabilize cylinder to allow
proper twist of knob.
Safariland, a bit faster to use in reloading.
HKS, more durable with use over time.
Safariland, "new" school method but
reliable.
HKS, "old" school method but reliable.
Safariland, not as many caliber choices.
HKS, seems to cover most any revolver
caliber.
Safariland, not as durable with repeated
hitting of concrete floors, being stepped
on.
HKS, never seem to get damaged.
Safariland, more expensive.
HKS, more economical.