You’re on the right track there. Of the manufactures I use, and have visited, CROnsrud is often on the floor. Even the smallest entry level machine like the M series, is considerably more expensive. The M series is rack. And for that matter, most production machines with “long” axis are.
While I work with the industry, and have worked in it to some degree in natural stone fabrication, I am certainly no expert in the mechanics of the machines. So take my current perspectives with a with a grain of sand. The mechanics at these facilities have suggested that rack systems and bearing systems both have advantages and weaknesses, one is not simply superior. The rack being generally preferred on the long axis, the bearing on the short(Z). Some of the reasons for this: The rack provides essentially linear rigidity despite feeds, faster accelerations, and easier maintenance. The bearing rigidity is not linier under acceleration due to bearing whip, and requires additional engineering considerations. They change out various components on schedule, the gear boxes, pinions, and rack; but its apparently a breeze compared to bearing systems, which also require drive train changes on some scheduled interval in these 24/7 shops. So while the bearing is capable of higher potential resolution, the rack is generally better placed for speed and linearity on a long axis. I’d guess it comes down to what you make, how fast you want to make it, and how much you have to spend. Certainly large bearing machines on the floor, but they seem to be in another atmosphere of price point and complexity.
Anyway, sorry to get off topic. I enjoy checking out and learning about these things. Pretty neat to see how automated these shops are. Autoload and unload, automated box and packaging machines. Everything is a robot.