I can't comment on the AT-pro, but the CZ's are one of the deepest coin hunting detectors ever made, they also excel in all types of hunting, the 2 frequency makes it awesome for salt beach hunting. I owned 2 CZ7a's and loved them. The advantages I see with the At-pro are it's waterproof casing, and dd coil. Over all I would go with the CZ3d if I was planning to old coin hunt, and throw a 10.5 spider coil on it. I'm actually considering buying one if I can't get enough funds together for an E-trac.