OK, I'm going to come out of self-enforced hibernation for this.
You're in basically the same position I was just over a year ago, so let me give you a few pointers from experience.
Firstly, there are NO honest objective comparisons of all of the three major tech-cam ecosystems out there. No dealer (that I know of) sells them all, and I've certainly never come across a photographer who has owned all the systems. This stuff typically doesn't get reviewed independently either.
Would you trust a Mercedes dealer to educate you about the merits of a BMW? No. You would not. So don't rely on a dealer of any of the tech-cam brands to educate you about the competition.
Note that I say "ecosystems". This is important - you cannot consider the camera in isolation. You have to think about what it is you want to shoot, and then work out which system (camera(s), lenses, accessories) will work best for YOU.
Individual photographers who own any of these systems will have spent a lot of time evaluating the various options based on their own personal needs prior to shelling out a considerable amount of cash to buy into the one they believe is right for them.
Once you're bought in, you're pretty much stuck with your original choice unless you want to take a significant hit on resale. So take your time, do the research, think about where you are as a photographer now, and - more importantly - where you want to go, and evaluate accordingly.
Open question to the forum:
How many people here have bought into one tech-cam system (typically Alpa, Arca, or Cambo), and then realise they made a mistake, sold it, and bought into another?
And that's where post-purchase rationalisation will come in.
You'll find it hard to find someone who has spent upwards of $10K just to get a camera and lens to admit that maybe they did the wrong thing. Now, I strongly suspect that the vast majority of people who get into this game do a stack load of research to make sure they make the right decision up front, but again, to stress, that will based on THEIR requirements, not YOURS.
Don't fall for the "you have to work with a dealer" line. It's simply not true. I bought my tech cam system pretty much sight-unseen based on detailed research on this and other forums and having a clear understanding as to what it was I was after, and what I potentially wanted to do in the future.
This is where I started:
Instagram
And this is where I am just one year later:
Instagram
(I still have the TC, it's just that it's the one thing that doesn't live in that case.)
Welcome to Dante's inferno. It is bloody brilliant in here.