I use both wrist band and safari jacket, though due to the cartridge sizes I use, I use the wrist band with the double and the jacket with the No. 1

I honestly don't think there is much in it, you just have to get used to whichever you choose...but I found the trick with the double is to grab them in a way they are spaced in your fingers to just drop into the chambers of the broken gun, but that's not exactly relevant to a single shot!!