The Charter Arms .44 and Taurus 445 .44 are compact light weight revolvers for ccw. The GP100 5-shot .44 is camping wilderness revolver (open carry 🤠 style) which is about 10oz lighter than Redhawk 6-shot .44 Magnum. To most knowledgeable gun guys alternative to these Rugers would buy S&W Model 69 .44 Magnum to use .44 Special cartridges in it. That is very well conceived hard to beat product.
Basically Charter Arms is urbanite defensive gun and Ruger product is open range country-style defensive revolver, worlds apart.