I have said this a few times on other threads. When I moved to euphonium last year, I was initially using a SM4X. After about a month, I gave up with it, mainly because it was far too bright of a tone for what I wanted (almost baritone like). I agree though it was a little more easier in the upper register (only by a couple of notes) and articulation had a bit more clarity to it. I ended up buying an SM4U, which is what I have been using ever since. Takes a bit more when going upstairs, but has a much more full and dark tone. And I don't have the most perfect embouchure.
On a side note, I am wanting to try an SM3X and compare it to my 4U soon to see what it is like.
Yamaha 642-II Neo Euphonium (2016) - Denis Wick SM4
Besson 956 Sovereign Baritone - Vincent Bach 5G
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