Yep, I almost went for the 12.9, but decided on the 10.5 in the end. I still have my 15" MBP, and with my iPhone 7+, the 10.5 is bang in the middle. When I hand over my MBP to my son, I'll consider a 'laptop replacement' then. For now, I can still pop the 10.5 in my bag, hold it with one hand and use in tight spaces.
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You were right! A lot of swinging from one to the other, but the 10.5 suits my needs best for now, and I could get the 256GB for less than the 64GB 12.9. My Air 2 was 128GB, usually about half full, but I didn't want to go back down to 64GB as I like not having to worry. I'm on my narrow boat holiday for a week next week so lots of Netflix, iPlayer downloads to go on. 128GB would have been fine though - Damn you Apple!