I coppared both of the 34 / 38 mm versions, and I find both of them appealing.
The 38 mm is maybe easier to wear, even if the 34 mm is not that hard to wear, due to the fact that the aperture of the dial is really important.
The important thing is that the bigger size of the new MUT is not going with a too thick case.
yes, it is also thicker than the old MUT ( which is still in production ), butthe volumes are well kept, to me.
Best,
Nicolas