The Rytm is in my band mates set up so I actually don't use it at all. I use an OT / Tempest combo but the combo is more for live use. When performing I have the mains and voice 1 of the Tempest going into the OT inputs (A/B, C) which allows me to treat the Tempest as 2 different synths on stage. Or a drum machine and a synth or whatever. The OT takes care of midi + clock for all the band machines, click, backing (if any), and set / song sequencing.
In the studio I tend to write on the Tempest and Pro 2. The OT is always being used as the midi brain for everything, but I tend not to send audio through it until the recording is stage is finished and I'm looking to spice things up or mangle them.
For this track I used the Tempest for the basic beat and then used field recordings sequenced and treated in the OT for additional percussion. My band mate added a rytm drum line somewhere along the way as well as wrote some midi drums in the DAW which we later replaced with Tempest sounds towards the end of the process.