I'm taking both to the Nashville area to have them tested by a couple of experts. One guy has been using GTs since they came out and selling Minelabs for 20 years and the other has at least as much experience using and selling Whites (He personally uses the MXT). Both of these guys have outstanding reputations. Once I know that my machines are running "normally" I'll continue to use both machines on every target. I've been doing this already for the past several days.
I've already identified some strengths and weaknesses in both detectors. I understand that my results will only apply to those that are hunting for similar targets, with similar soils, etc., but the info could be useful to some....
If nothing else, when I'm done I can say "if you're working Civil War campsites, with sandy/clay soils, and the whole area is covered with square nails, and you can only buy one detector, and you've narrowed it down to the MXT or the GT, then I would recommend the __________"
That kind of info might be useful to someone else...but I'll be content just knowing the answer for myself!