Bama.
Yeah I would say that in moderate-to-mild ground the Tejon beats the MXT by nearly 2" in all-metal AND disc. The Tejon was designed for that particular type of soil and primarliy for relic hunting. In really bad soil though, leave it at home and try a magnet instead. I almost HATE the Tejon in really high iron or salt soil. It won't even completely ground balance in it, regardless of what I try. I thought about going inside and adjusting the sensitivity pot but that would only cut down on depth a bit. It runs on full gain all the time and that is the big problem.
The MXT on the other hand seems to weigh about the same as the Tejon because of it's nice balance. It does have a lot of trouble with high minerals though, especially hot rocks, and this is because of the 9.5 (950) stock coil, not the detector. Toss the 9.5 over in the corner somewhere and strap on a smaller (or) DD coil and it will make you smile the rest of the day. If you lose any depth with a smaller coil it will be minimal at best.
I currently use a 3" coil on my prefered Compass and it gets only 1/2" to 1" less depth than an 8" coil, and sometimes it gets the same depth or more. It does find even smaller items like smaller than BB's, but the pinpointing is still the same and so are it's cherry-picking abilities. Internally, the windings on a 3" are little less than the diameter of a 6", and besides that, it's a Compass with it's atavistically best design for cherry-picking and discrimination anyway. This is also true with Tesoro coils. There is no difference in depth between a 5" and an 8" Tesoro coil, I've tried them both side-by-side and with two different detectors switching back and forth.
If you try a smaller, lighter White's coil you will like the lighter weight at the coil. If you live in a high iron area, keep the MXT, but if you want even better performance get a Fisher or a Minelab, but the Fisher will make you a lot happier in the end, and you won't wind up selling the thing for 1/3 the original KellyCo price like many people do with Sovs and Explorers. The F-4 is a real mean SOB, but the MXT is a better nugget hunter, by far. The MXT is an offshoot of the infamous GMT, a very good nugget hunter. The Fisher F-75 beats the MXT though, in almost every way, including nugget hunting and absolute depth..
Another really nice one to consider is the Lobo Super Traq, maybe the best overall detector now made in it's price range.. If that's a bit too heavy, think about a Silver uMax. That detector is simple, has really decent depth, especially with an eliptical coil, and weighs hardly anything, 2.2 pounds. It doesn't have a lot of toys but it is a superior coin hunter and can be used to hunt BB sized nuggets and bigger. It handles bad ground fairly well, but not as well as the Lobo Super Traq. The new F-2 is very light too, and quick and has good depth and disc abilities, but it's not as light as the Silver.
Just a few ideas to play with.