Two totally different systems and, most importantly, styles of shooting. Comparing the two is really up to personal preference (and the subject-matter of photography).
I come from DSLR background. I started "seriously" getting into photography from a digicam, quickly switching to DSLR and using it for a few years. With DSLR I started to realize that photography was quickly becoming a big part of my life. I shot a lot (admittedly still not "great") and dedicated a lot of time to researching equipment, styles and techniques. Then I realized I wanted to upgrade and quickly sold off ALL my gear including lenses in hopes to start buying less stuff but GOOD stuff. While I was waiting for an update in Canon's DSLR line and saving money for it I picked up a couple of old FSU rangefinders on a fleamarket and............
Canon DSLR never happened. All of a sudden I discovered how much RF system fits me and how much, if I may be so bold, my photography improved in one simple step. RF and film. I also realized how affordable good film gear can be and subsequently contracted the so called GAS.
I also started to realize little nuances about gear that I have sometimes heard about but never paid attention to, like how RF viewfinder gives you whole different feel for framing, being in the scene, no mirror blackout, focusing style, etc.
Then there's this distinct look to rangefinder results, photos. It certainly has character that fit and even make some scenes. And it's a different style of shooting that is partly result of, what I find, psychological effect carried by the style of use of the gear.
All in all, right now I have a 50D sitting next to me with a couple of "L" and a tilt-shift lenses (thanks to where I work I have easy access to variety of good DSLR gear, although I'm not a photographer in a professional sense of the word). It all sits here collecting dust. Everytime my hand reaches for a camera I just can't pick up DSLR over a rangefinder or the Hassie. There's no going back 🙂
Oh, and any DSLR with a lens is certainly larger than an average Leica).