I bought both when I could preorder the digitakt. I loved the digitakt for being easier and faster to work with. I regretted it later, but I sold the digitakt rather than shelving it to focus more on the octatrack. There were still some major bugs to be ironed out at this time as well. I loved the octatrack but decided to sell it bc I found more reason to have a digitakt and digitone combo. I ultimately decided to upgrade to octatrack mk2 and have the digitakt and digitone on the way.
When I originally had the two they were awesome together. I was a fool to think I’d be better off with one over the other and have regretted selling them both. There is a tiny bit of overlap, but I don’t see what would make one more qualified to keep over the other. This round I’ll be keeping them all, they’ve made the forever list with my legacy elektron machines.
I don’t know if my opinion helps, but I’d say keep your octatrack and add too it. The octatrack and digitakt combo is killer together.
Good luck!