I currently have the Digitakt, A4 + AR MKIIs as far as Elektron gear goes, and I find it to be idyllic although I have been considering parting with my Rytm due to its hairy, heavy natured sound… I have gone through two Octatracks.
The Octatrack is infinite and amazing, but you absolutely have to have some sort of planned use case. This is my opinion based on personal experience. You can make basic music on it sure, go into it as a blank slate, experiment endlessly, but that’s not what it excels at. It excels at sample demolition and processing.
I’m considering purchasing my third OT in maybe another year for use as a live looper and processing unit for all my other gear. Other than that, it never fit my workflow regardless of its cryptic interface and flow.
Besides the quick nature of the DT, I prefer whatever finalized sound architecture it has. Call me crazy, but the OT has “a sound”. Perhaps it’s the slightly dated effects, but it always did to me. The DT on the other hand has a sound I adore. Lastly, the MIDI implementation on DT is superior (for my use cases). With my Novation Summit I can have two channels sending MIDI patch changes per step! That is bonkers with a synth like the Summit. A single channel on the DT has 4 note polyphony, classic MIDI CC parameter locking, and patch changes per step. I’m considering a Digitone also in the future just for that insane MIDI set, never mind its own beautiful FM sounds.
Just my opinion. The OT excels in use cases, it is harder to experiment and get something that feels “correct” as compared to the more limited DT.
If you don’t know why you want one, it may not be the best idea… Or it could be! Who knows.