An MXT was my primary detector for several years before finally trying an SE. While the MXT certainly was able to find lots of stuff, I now know first hand that the SE is able to out hunt the MXT for older, deeper coins. And that's after having gone through the same areas on the MXT with the 4x6 DD, 6x10 DD, and 10x14 DD coils, very little discrimination, and as much gain as would run stable. Yet the SE has pulled much more out of these areas with the 11" Pro coil. The target separation and depth have been so marvelous on the 11" coil, even though I have an 8" coil, I've yet to feel compelled to put it on.
So what's the difference? Personally, I'm convinced it boils down to two things: Minelab's FBS technology, and within that, the technique they use to filter out the ground signal. The White's still has to be ground balanced, and has autotrac capability, but the Minelab approach is just fundamentally different.
But on silver, keep in mind also that the MXT runs at 14.7KHz, which is a bit on the high side for higher conductive targets like silver. If you're specifically after silver, then a lower frequency unit would typically be better, although the MXT can find them. The deepest I was ever able to go on the MXT was around 7 inches on a silver dime though. And that was under optimal conditions. I think the SE can go another couple inches on that easy.
I still have my MXT, and I still think it's a good detector, with it's "turn on and go" approach. I plan to keep it for "guest use", and for jewelry hunting or beach hunting, it's probably the unit I'd go with. But I haven't touched it since picking up the SE.
HH,
DirtFlipper