OT MKII and DN are 2/3rds of my only hardware and I gotta say if $ was the main issue, I’d go down to a MK1 OT to keep the DN.
Having them both is great.
But @Howl, since you have a Sub37 and OB-6, I think you are more than covered with just the OT MKII, unless you are itching for what DN does (FM, subtractive and additive, all in one), but it sounds like you might not be.
Also, a note that since you are also using your gear with Ableton, be sure to check out sequencing Drum Racks with OT MKII. It’s so powerful and relatively easy to setup. I’ve recently gone through and re-configured my favorite drum racks to correspond to the track/sound assignments I generally use with OT’s MIDI seq.
I sold my Rytm MK1 to a friend and this has helped me cope with not having a dedicated drum machine.