I received MT3 sets recently, as well as a Chinese copy of XDA-profile [called ZDA].
Both are highly dependent on typing angle.
MT3 is very scooped, very sculpted, and tall. It's like a super-OEM, kind-of. If you can type on OEM, you can probably type on MT3 with some adjustment.*
The problem is, MT3 doesn't work at the typing angle of a standard full-size keyboard in an under-desk tray, for me.
However, it does work at desk level, especially if the desk is at approximately arm-level. I've also seen people use it on boards that are barely elevated, almost flat.
At the same arm-level desk, XDA was a bit problematic. I found myself hitting the sides/edges of keycaps. It was as if the angle needed to be higher to work for me.
(Typing angle felt shallow, I was brushing up against the bottoms of upper-row keycaps.)There is information publically on-line about the case elevations MT3 was designed to work at. I think it is something like 5 - 7 degrees.
So I think it ultimately comes down to typing angle: where your board is, and how elevated it is. You may have to buy both and test them. It's just the cost of doing business. MT3 should have a relatively high resale, particularly if it's the PBT variant and hasn't been used much.
I ended up taking the XDA-profile keycaps off my KBD67 Lite, even though they looked awesome. Because the typing angle felt too shallow. But on the same desk, I can use ABS MT3 fine on a Rakk Lam Ang Pro, which is an average-elevation TKL.
*MT3 is very different from OEM, in that is was designed to resemble beamspring / 1970s keycaps. But the sculpting angles kind of remind me of OEM, and it's not much taller than OEM. MT3 is not quite the same experience as those tall weird SA keycap angles, it's closer to modern OEM in that regard.
But of course MT3 is spherical instead of cylindrical, in terms of scooping.