My conclusion: it's a fine renderer, but I prefer LuxCoreRender, because:
1. I like the look of LuxCore's renderings more.
2. I find Octane overly complicated, with too many settings. For example: image texture node Gamma needs to be set to 1.0, Blender Color Management settings need to be changed to None, Octane Camera Imager needs to be activated, Gamma needs to be set to 1.0 there as well, then you need to determine a LUT, and so on. Too much hassle, not artist-friendly.
3. To render with Octane you need to install a separate build, and I'm used to working with the latest Blender alpha builds for the latest features.
4. There's no material / texture preview mode in the Blender viewport.
5. LuxCoreRender is fully free and open source, while Octane is only free for Blender on Windows and a 1-GPU PC.
6. To run Octane you need to install a separate Octane Render server and run that each time.
Just my personal impression, not an attempt to start a renderer war.
