Bianchi brand shown above). Many revolver shooters find the flat profile of speed strips makes them easier to carry than the circular speed loaders. Carrying reloads is as simple as dropping one or more speed strips into a pocket, pouch, or purse.
All things being equal, a practiced hand likely will be able to reload faster with the circular speed loaders than with the speed strips. However, for many folks, speed strips are much easier to learn how to use than are the circular speed loaders.
Even in an unpracticed hand, many folks may just find that they can reload faster with speed strips than they can by inserting cartridges into the chambers individually. The video above details a method of use.
Do I always carry reloads? No.
Del Fatti Leather (SSC). They are designed to fold over and snap onto a 1.5'' belt, but work well even on the narrow straps of shoulder holster rigs. They also work for pocket carry; I find them to be very versatile. On a belt, it is likely that only another studied gun nerd would recognize the speed strip carrier as something for carrying ammunition.
For quite a while I shifted my only two speed strip carriers around as needed but that got kinda inconvenient. Recently I decided to increase the number of carriers to six so I could just leave them where I used them the most, such as on certain holster rigs and in each of the different pre-stocked travel / hiking / fishing / bugout "kits" that I keep ready to go for special occasions.
S&W 442 revolver in a Ken Null SKR shoulder rig with what has become the its dedicated speed strip carrier.
Colt Agent revolver in a Ken Null SMZ shoulder holster with what has become its dedicated speed strip carrier.
NOTE: All guns are locked in a safe unless I am using them; no guns are left just hanging around, unattended.