I have gone back and forth like this too as far as which one would serve me best, but finally decided that the aspect ratio is just not ideal no matter which model you own. One of the ONLY complaints I ever had about using the 12.9" iPad Pro as a laptop is that it's almost square shaped when you're doing actual work. That's great for art because it's more like a big piece of paper. When running apps side by side, it's less than stellar compared to a MacBook.
I didn't realize how annoying it was until I switched back to Mac full time. It wouldn't keep me from owning an iPad Pro again in the future sometime, but there are some low-hanging fruit tweaks that they could make to improve the experience. I don't care what they do to the OS. I can be productive in just about any OS. But I'd love if they moved the front camera to the adjacent bezel from where it is now, and they really need to do something about that screen aspect ratio. This isn't 2010 anymore and if you want more people to take the iPad seriously for productivity, you need to make these quality-of-life changes.
PS: I do realize I've been on this thread and other ones saying everything opposite of what I just said above. I have been very wishy washy about the iPad ever since those M1 Macs came out.