I've only used one focal length, so I can't give a comparison. I believe the difference between 17mm and 45mm (for example) in DOF will be dramatic, just like it would be if you compared non-TS versions of these lenses.
That being said, your subject matter might dictate the focal length you use anyway. I took this with a 35mm TS on a full-frame camera:
I couldn't have backed up any more in the spot I was standing, and I wished for a 24mm TS instead. 45mm would not have worked and 90mm was out of the question.