Non-UW is still fine. Though it, by default, doesn’t come with the +drive, so you’re going to have to keep that thing near constantly plugged up to your computer midi interface for backing up because you don’t have any extra projects.
And with all the synth engines in that monster(and the unfortunate shortcoming of workibg strictly with lots as far as presets are concerned) you’re going to fill up all the available patterns trying things out and exploring(I say this to the favor of the MD)
It’s a beautiful, beautiful, beautiful Machine- and a non-UW is better than no UW at all.
But you will probably want a UW at some point. (Field recording percussion just sounds amazing running it through its engines and resampling really offers a whole world of possibility)