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Hi Grant and welcome. The Rost Martin will have a slightly longer barrel, 4 inches compared to the GX4XL 3.7 inch, is a couple of ounces heavier than the GX4XL and have a larger grip frame and magazine capacity advantage. In short, the GX4XL is smaller, lighter meaning easier to conceal. The advantage of overall capacity and overall larger dimensions go to the Rost. Your choice will depend on which aspects of each is most important. Cheers, stay safe and enjoy!