I recently picked up an ATX and am very happy with it. I like the ability to fold it down and backpack it into areas for prospecting. Having both hands available is a plus when you are climbing banks. I also like the ruggedness of the ATX. When I hit on a target and lay it down to dig, I am not concerned about sand, gravel or even a little water.
You can't go wrong with the ATX as long as you can deal with the weight of the unit. Best of luck with your pursuit!