you could start with this essay I wrote on elektronauts a while ago on the topic of pyramid vs OT (midi side only) : https://www.elektronauts.com/t/octatrack-only-as-a-midi-sequencer/28700/37?u=autopoiesis
some mentioned detractors have improved on the pyramid since then, but I still find the OT is more fun and faster to use for: step sequencing multiple parameters per step (especially midi CCs - no need to scroll to a different page per CC), monophonic sequencing (pyramid has some annoyances in this department despite giving you a better visual overview of the notes), looping random MIDI LFOs, ratcheting, gate sequencing (due to trig conditions), and speeding up / slowing down a given track via timebase multiplication and division.
the Pyramid is better for almost everything else you might want to use midi for. it handles polyphony 100x better, has nice shortcuts for chords and some clever midi fx, allows you to create and trigger and sequence (in song mode) different variations (patterns) per track, gives you hundreds of bars per track to program your notes and CC automations, serves as a pretty flexible DIN MIDI and USB MIDI and CV routing hub, has a rock solid MIDI clock that can slave Live 10 very stably, gives you powerful CC-to-FX and CV-to-FX and CV-to-CC translation tools, allows intertrack transposition, has extremely convenient instrument definitions for your tracks, and offers a much clearer visual overview of your sequenced parameters than the OT (where you have to press a step to see on the screen what values are locked to it, and only one step at a time).
I love using the OT to modulate pyramid FX parameters with its MIDI LFOs, to step sequence multiple CCs per step, to use its trig conditions to override Chance FX values (and thereby smuggle trig conditions into the Pyramid), and to produce looping random modulations that I record into the Pyramid. I slave the OT to the Pyramid’s clock and transport and use the Pyramid for all my other MIDI applications.
the combination of the two leaves me with complete disinterest in owning any of the nicest Eurorack sequencers and clocked modulation generators I’ve tried, as well as any interest in fitting a Cirklon (which I’ve also given a thorough trial of) into my setup.