Good luck on your journey.
I think itās worth pointing out that the Rytm isnāt a drum machine, more a drum computer, which might seem splitting hairs but i think this is why I struggled with my AR for so many years. It has a lot of dna taken from classic Roland gear but unlike that Roland gear it feels very different, in that it isnāt as immediate, nor sounding as good out of the box. Most drum machines are pretty preset heavy and focus around dialled in sounds that work super well together or have huge sweet spots. I found i definitely have to get the AR setup to use it in certain ways to get better results, probably why projects and kits are popular as a useful shortcut. Once you do that though it sounds pretty damn good.
I have been doing uploads to Youtube most days with free projects, mainly to push this machine to its limits and to dig deeper why I struggled initially, and already after 54 uploads, i have shifted to enjoying this bix more and more. The videos cover a range of experimental sounds, approaches that may be useful for you to help you decide your direction to create and free projects to try out, some Google Sheet to help with setting up Keyboard tracking, which for me having grown up around techno since the 90ās, super important. I think this comes from using the SH101 so much, itās just so useful, and the Rytm doesnāt do that out of the box, but you can set it up pretty quickly and it makes a huge difference to me.
You also mention the 909, and there is a way you can do round-robin style with samples using the LFO, which does make 909/808 samples work really well. I have posted how-tos and samples elsewhere on this forum and my Github, along with AR projects most days.
The other thing is although the AR has one LFO internal per track, you can set it up to use a track as an LFO or modulator and then use one or both of the Control Inās for more LFOās. You can even modulate the modulator. This make it sound similar from your standard LFO to env follower style or audio modulation.
I have been playing around with sampling Korg MS20 LFO shapes and using that to modulate stuff, which i will probably share later today, sounds pretty dope.
Good luck with your choices and do share your techno when you make it. 
Here are some useful links for you, and anyone else who might be lurking here.
Keyboard tracking math:
AR projects:
YouTube channel:
Round Robin setup and files: