[criddell]

You will probably be very happy with the Air. I'd recommend the big one.

I use a 2018 13" iPad Pro and I love that size because it's basically the same size as a sheet of 8.5x11 (or A4) paper. It's the perfect size for reading and marking up PDFs too.

Last year I bought and returned the M4 iPad Pro because they didn't make a Smart Keyboard Folio for it which I prefer to the more heavy duty Magic Keyboard. So I'm still using my 7 year old iPad worrying about what I'm going to do when it dies. I thought for sure somebody would make a knock off, but nobody has made anything that I think is as good as the Apple product.

For me, Procreate and GoodNotes are a killer combination that justify owning the device.