My personal opinion is that you’re looking at the right set of manufacturers. I too had a hard time deciding. I am absolutely thrilled with my ShopSabre but I think I would probably be equally happy with CAMaster. There is a lot of quality bits on both brands, making them top tier IMHO.

If given a choice I’d go ball screw, but that’s probably more my father, who was a machinist, talking more than anything else.