I will agree with Arjay's comment. 🙂 They are certainly different, but most of the time I could toss a coin to decide which to take out for a walk. There are the obvious specialties of course; macro, tele, low light...
For the SLR the view shows less DoF than you'll probably be getting, unless you stop down to check. With the RF you have to guess or go by experience. With the SLR the faster/longer lenses are easier to focus. With the RF lens speed is not a factor in focusing so wide slow lenses are as easy as any. With the SLR there is no lens/hood intrusion into the VF view, you cannot see outside the frame, the field shows whatever the lens sees, and you can focus anywhere in the field. Both can be enjoyable to use.
Pondering the possibilities and choices, for me I like to use the cameras I like to use... um, right! It's all about the user interface. I'm not so fond of the Kiev 4a and the Fuji 670III. I appreciate an efficient size, like the Minolta CLE and the Bronica RF645, as long as they're comfortable and easy to use.
I don't think there are any consistent pictorial differences between my RF and SLR photos.