Safety razor requires more time to shave than cartridge razor because it requires more strokes. But I actually prefer it because usually I don’t shave every day. Cartridge razor clogs up in this case. When I shave every day I use either cartridge razor (Dorco) or wet electrical (Braun 9000). Both work greatly for daily shaving, fail for shaving every few days.
You can get a razor that has 3 blades and uses the standard double edge blades. You just snap them in half inside the wrapping and then load the 1.5 full size razor halves in.