Hello, I use both the CTX and the AT Pro. I love the CTX and consider it my "main" machine, but there is not a great big gap between it and the At Pro, for it's price, the At Pro can not be beat. I hunt in pro mode, iron discrim on at 35, nothing notched out. I have made some great finds with those settings and I want to hear the iron grunts so if there are "peeps" of something good in all the iron I can dig it. It to me is like digging it all without actually having to dig the iron, I mean I can hear it and know it is there but I just don't have to dig it. As you are after relics you may want to lower your Iron a little bit, I'm not sure what big Iron like a cannon ball or horse tack or whatever might ring in as so you may have to play with that a little to decide "good" iron from bad. Good luck, hope this helps!