Safariland and Maxfire speedloaders should be carried so the LEFT hand can access and use them. While the HKS-types require you to hold the cylinder still against the clockwise twist of the knob required to release the rounds, the Safariland and Maxfire loaders do not; so, all your right hand has to do is maintain a firing grip and let gravity keep the cylinder open, as you align the speedloader with the cylinder. Then, all you have to do is firmly press the Safariland loader down/forward towards the muzzle to release the rounds, which can be done just as easily with either the left or right hand. The Maxfire pretty much REQUIRES the left hand to pull it off/away from the cylinder, it is again harder and less natural to do this action with the right hand.
I can't talk about the Maxfire, but I carried Safariland speedloaders while on uniform duty and also used them in PPC competition, the speedloaders were always on the
right in front of the holster. When I was shooting PPC competition in the Master Class, 95% of the competitors used Safariland speedloaders, and 95% of them carried them either in the center of their belt, or to the right, and used the same reloading technique that I use.
For reloading
1-open cylinder, put fingers of left hand through the center of the frame, invert and use the left thumb to dump the empty shells, the fingers of the left hand are wrapped around the cylinder, simultaneously you are retrieving a speedloader with your right hand.
2-holding the revolver in the left hand, place the loaded speedloader into the cylinder, press forward to release the cartridges, close the cylinder with your left hand while simultaneously re grip the revolver with the right hand. Your left hand fingers have been wrapped around the cylinder to control and line up the chambers with the speedloader.
If you are in a hurry, a combat or competition speedload, the speedloader drops away as you close the cylinder.
This is extremely fast, and the revolver is in perfect control the entire time.