Having both I can’t say one is better than the other. The sequencer on the Digitone kills the monomachine as it’s roughly 15ish years older than the Digitone. The sound on the Monomachine is pretty nebulous. I slept on it for years because everyone just made plastic digital chip tune kinda jams with it or minimal techno. Turns out you can do a lot more with it but it involves a lot of exploits in the gain staging. adding clipping and saturation that can give it some analog breath. I’ve been focusing on that aspect in my recent MnM explorations. especially after picking up granules by Auvrel (Ess) and learning how they were designing digitone sounds around the headroom limits.
I think Digitone is overall a better standalone unit but Monomachine has a place in someones rig.
Here’s two of my more recent experiments with MnM