I think this thread was pretty informative for your question…
Edit:
My opinion, which is just an opinion…But, in my experience, learning the OT is better if you focus on just the OT. It can take a bit of practice without distraction. Although the DT is very easy to learn, I had both at the same time for a bit and had a hard time concentrating on one or the other. But, I am sure that was just me.
As I learned the OT (I was one of the people that learned slow) the more I just wanted another OT…or maybe another drum machine, to sample and join the OT with. You can just use the OT as a simple mixer and midi sequencer, in a very simple way. I use it very simply now, but it took a long time to find how I wanted to use it, because there are so many options to explore (and practice). Now I just turn it on and it does exactly what I want. I wouldn’t get a DT because I can’t use one in the way I use the OT.
For hard techno, I might suggest a simple machine with zero learning curve…Maybe a model samples, and use a mixer and some effects to make feadback loops. Model Samples would be a good simple choice, so you can concentrate on practicing the OT.