thanks for the shout-out.
I have heavily used the Mini 5, 6th gen iPad, and 12.9 iPad Pro as digital planners, note taking, journal, project notebooks. My current (and only) iPad these days is a 256GB Mini 5. It works great for those purposes.
The big question to ask yourself is, "
what size pad and pen do I currently use?" That will help you determine which to choose. I have been using a 5.5" x 8.5" padfolio for my paper notes (that's 1/2 a sheet of US Letter size) and the Mini is so close to the same size that it works great. The Apple Pencil 1 works great with it and there are other alternative active styli that are comparable and don't need pairing.
The interesting thing is that I find myself more free to pinch-to-zoom to write some things where I (obviously) didn't need it on a paper pad. It simply might be a matter of "
just because I can".
If you are accustomed to using a full sheet of paper (A4) then the 8th gen iPad would work great... which obviously you'd already know considering that you use a 9.7 Pro.
IMO, the best overall value iPad is the 8th gen. The "classic" form-factor offers some benefits over the newer Air/Pro chassis. The 8th gen supports smart covers (as does the Mini 5). This allows for the lightest and thinnest options that provide screen protection.
The 8th gen also supports the Apple Smart Keyboard cover. That is extremely helpful in switching between a laptop-like device and a tablet/notepad by simply popping one off and attaching the other.
Regarding the laminated vs non-laminated screens.... the difference is noticeable but not distracting IMO. This is highly subjective so each person responds to the difference... differently. I went from an iPad Air 2 to a 6th gen iPad (laminated to non-laminated) and I have no hesitation in going back to a non-laminated screen.
My plan is to keep an eye on what happens in the entry level iPad space. The moment Apple announces that the entry level iPad is moving to the Air/Pro chassis, I'm going to snag the 8th gen, a smartcover, the smart keyboard cover (and probably a refreshed Apple Pencil 1).