One thought - when first getting into tech cameras, I was convinced for the need of shifting in both vertical and horizontal. No doubt about it. Worked with the Cambo, a perfectly lovely camera, but we never became good friends. Got into the STC, and find (like Dave) it fulfills most all needs - and in the odd occasion of needing some rise when using horizontal shift, just tilt it up and (horrors) sometimes correct in post. For whatever reason, this is rarely the case.
What is of particular good fun is the interplay between the orientation of the back, the camera mounting and the shift direction. Somehow, this gets the head working and engaged, and seems to just "gel". Don't know how or why, but it is a pleasurable experience. All to say worth trying this gear before buying. Hard to know what will work for you in the abstract.