I don't hunt for relics and I am not a prospector. I simply hunt old sites for old coins. For my type of hunting, I believe the faster sweeping XL Pro has better discrimination capabilities than the MXT. I believe the XL Pro is more sensitive to small targets. The wavering needle on the analog meter provides more information to me than the bouncing digital display on the MXT. And, in my soil conditions, the XL Pro goes just as deep as the MXT.
For coils, I would recommend the 5.3 and the 350 snooper. Unbeatable combination for separating trash from treasure. I bought my last MXT thinking I would use it along with my XLPro. I never use the MXT. The XL Pro is that good. HH Randy