I would use the Safariland belt rig...
As far as the speed loaders themselves... NOTHING BUT SAFARILAND.. I would avoid Dade loaders.. I carried them for years, but the spring detention system they use are not good for anything but carry in a solid plastic duty type holder.. Bullets easily dislodge..
I dislike the ones with the aluminum twist knob.. Not a natural motion to change directions, ( Indicate, push then twist..)
The Safariland Loaders have a much more positive retention system, a bit harder to charge the loader, but lighting fast on the release, and you can drop them, throw them and they will still hang onto rounds... They release with a bit of spring assist when the center of the loader make contact with the cylinder locking lug, they tend to throw the rounds into the cylinder..All one smooth motion, indicate shove, close n shoot.. Actually shoving the rounds into position with the palm of your hand after properly indicated.. I have seen many a practiced shooter out run a Semi-Auto in the reload stage..
We used to recommend Safariland Speed Loaders to our cadets in the days before we let them start out with semi-autos.. because you could actually toss one to your partner in an out of ammo situation.. They are about all you will find in use at PPC Revolver matches.. (the street version has little or no "Grab Handle" and the Comp Versions have a high knob on the top, too big for CCW...IMHO..