I have shot both and own the Schneider 60mm. Both are excellent lenses but I went with the Schneider. Both have huge image circles and allow for excellent horizontal shift and rise and fall.
Both of the lenses have a rather shallow DOF until stopped down. The Schneider seems to like F11 to F16 for my work. I have taken it to F8 with tilt. Shifting the Schneider was where I found it to be a bit better than the Rodenstock 55mm. The 60mm will go to 25mm before you really start to see much saturation fall off and detail smearing. I have taken it to 30mm and it was still usable. For extreme shifts the physical CF is a help but it you don't plan on shifting it more than 15mm odds are you won't need the CF.
On my shoots, I found the Rodenstock a cooler lens, the Schneiders seem warm to me. Contrast appeared better with the Schneider and it will pull in some amazing details. When I worked with the 55mm, I felt that the 60mm was sharper on center and markedly sharper on shifts past 15mm.
As you point out the cost if a big difference between the two, the 55mm being a "bargin" relatively speaking, also there seems to be more of them used on the market.