As for target separation, the 6x4 Shooter does a notably better job in highly trashy sites then does the 5.3. The reason has to do with the "window" of detectable area. Concentric coils, such as the 5.3, project a cone-shaped field into the ground, which is originally slightly smaller then the diameter of the coil, and progressively narrowing at depth. The so-called "double D," or "DD" coils, have a thin strip of detectable area running the length of the coil, so thus DD coils "see" MUCH less ground at any given time then does a comparably-sized concentric. This results in FAR better target separation in highly trashy areas. As to depth, at the SAME gain setting the 5.3 will get 10-15% greater depth then would the 6x4, in the VERY CENTER of the detectable field. But, AT DEPTH, DD coils scan a wider area then would a comparably-sized concetric coil. For instance, the 6x4 DD is really 6.75 inches long, and 3.5 inches wide. On dimes buried at 6" depth, the Shooter has about a 5 inch wide "footprint," whereas the 5.3 has about a 3" footprint. This is why it is always recommned that you overlap your sweeps with concentrics by 50% in order not to miss deep targets. Thus, "at depth," tthe 6x4 is really scanning more dirt, and does not require as much overlapping, as does the 5.3. Now, when it comes to that 10-15% greater depth, at the same gain setting, in mighly mineralized soil you MIGHT be able to use a higher gain setting with the DD, and thus get back the "lost" depth; indeed, you might even exceed it. In my soil, which is highly mineralized, I get as much in-ground depth with the 10x6 DD as I do with the 950, due to being able you use higher gain with the 10x6. Likewise, I get the same depth with the 6x4, with higher gain, then I do with the 5.3. My local White's dealer reports that MXT buyers opt for the 10x6 or 6x4 about FIFTY TIMES more often then they do for the 5.3. But, both the 5.3 and 6x4 are great coils, and each has a loyal following. Frankly, the only way YOU are going to know which one YOU like better is to try them both out. Hope this helps; HH jim