I bought the 11”. Retuned it for the 12.9” with cellular and 256gb. I love this device. Best Apple product in years imho. Since AirPods at least. It has replaced my laptop. I use it with a Magic Keyboard. So good for work, Word, pdfs, editing movies, photos, watching movies. Never gets even warm rendering 4K video where my MBP sounded like an F-22. But...
It still a bit big for couch, bed, lounging consumption. For that the 11” was perfect. So, I know it’s insane but I’m going to get the 11” as well. I get so much use all day out of these things. I plan to travel with both. Will browse, surf, read on the 11” on a flight but switch to the bigger one for work and movies or photo or video editing.
For years I travelled with an MBP and an iPad. So I’m telling myself this is the same thing...