Trying my friend's iPad Air is what sold me. I just went "oh".
I tried a Surface, thinking that I could also replace my laptop and pack lighter (I travel by motorcycle a lot), but it was unusable as a tablet, and... well as annoying as any Windows laptop. The Photoshop-like UI and the open-edit-save workflow (can't close an app without messing with the file dialogs) was so pathetic compared to Procrate and Notability. Then it locked itself up for 3 hours to install more Bing shortcuts on the task bar. That's when I returned it.