For my soil conditions, the 6" DD seems to be a bit deeper, (1"?), than the 5x10. My ear is better suited for the 5x10. Seperation is unbeatable, except by the 6"DD. IMHO.---- The emission area of the 6" is razor sharp, and I think I sometimes do not hear a good target. But for absolute peak seperation, and sensitivity, the 6 is better. ----Still I prefer the 5x10 in most cases.------- I would rather cover 100 sq. ft with high confidence, than 10 sq. ft. with absolute precision. Depth? in my ground, 5-6" with the 5x10, and (maybe), 7-7.5 with the 6"er running hot.Somes a few notches of GB offset seem to really improve depth performance.-------- Take either of these coils to an area that you have hunted before with any other Minelab coil, and you will find many targets that you missed.------ Especially if you used the 9" LF or 10.5 DD. -------- FWIW, here is a list of my coils, in the order that I like to use them, 1-- 5x10HF DD, ************* 2--9" MF stocker, ************3-- 6"DD HF ***************4-- 9"Concentric LF,*******5-- 10.5"DD MF. (I guess that is should say I hunt coins mostly), -------- I just don't get to hunt many areas where I can effectively use the 9"LF, or the big 10.5DD. To much trash. Undoubtably deeper seekers, but the 5X10 seperates better, ID"s better, is lighter, and loves dimes. --- just my opinion, but I think most would fairly closely agree.