and despite what many think... Leica didn't invent the rangefinder nor the camera. Nor were they the only ones making a rangefinder cameras. Heck, they weren't even the first rangefinder camera to enter into digital world. So you don't need to have a Leica to know anything about a rangefinder camera. In fact, many believe the best rangefinders post-WWII weren't made by the Germans but the Japanese. Nikon being one of them. Canon also took the LTM rangefinder and the basic concepts from Leica and had their series of rangefinders. I have two. The Canon is superior to the Leica it copied from in so many ways. I would shoot a IVSB over a Leica LTM of the same time period any day of the week. Nikon rangefinders was a bit more accurate on telephotos due to their longer base rangefinder length.
Assuming the OP meant rangefinder. For macro, times when a zoom is beneficial, and telephoto, I would choose a DSLR. For times, when I need something that is as fluid and natural as an extension of the eye, I would choose a rangefinder. No blanking of the view... you see all subjects at all times.. entering and leaving the frame... you see absolute DOF as to clearly see foreground and background no matter the aperture selected.... you are not isolating the world with a tunnel.. rather than bringing a frame into composition. Think of it as compositional addition rather than compositional subtraction... etc.. hard to explain but I would chose a rangefinder for almost any situation that its properly suited for. btw...the best handling digital rangefinder I have ever held is actually an Epson... not Leica.