3D is a small part of what I do, and Iām deep enough in the apps to get by, but not a power user by any means.
When I dove into that world, I did do some research for which platform would be best suited, and what I found is that they definitely have very distinct audiences. C4D in particular caters to the MoGraph use case (which is what Iām interested in), while others cater to other use cases more. So that should be definitely be a consideration.
The next thing you should consider is import/export paths. When you have to transfer geos and other parts between Flame, Nuke, C4D, Blender there are definitely affinities that make that easy and thornier paths. Ending up with the wrong combination can be a major frustration point, and one that is not easy to overcome.
Lastly I would look at community and educational access. As you learn a new platform you need to have resources. If you think Flame is complex, the menu structures of these 3D apps is another order of magnitude.
Iāve found that C4D has very good support on this front. The Maxon YT channels and their trainers are very good. There is also a lot of good community like Greyscale Gorilla (who started out with C4D but is starting to support all the renderers). I suspect that Maya is much weaker there. The same also goes for the ancillary tools like particles, textures, material libraries.
Itās probably true that there are more Blender artists out there than any other platforms mainly due to its cost and accessibility. And presumably some amazing talent. But it may trend more freelance and independent, than large pipeline / studio type of work. But that may be a gross simplification.
I might be tempted to put Blender on par with BMD Fusion in terms of audience and usage (though I think Blender may be a stronger tool). Whereas Cine4D is more like Nuke, and Maya more like Flame Just looking at who uses it, how big it is, and how ācorporateā (i.e. uptight) the companies behind them are.
Because of the complexity though, you do want to do the homework. Switching 3D apps is a massive learning curve. I did for a short time consider whether I should learn one of the others, and quickly gave up as itās not worth the time for my more limited use. C4D is suiting me well.