I believe he has said the Supernote A5X is his favourite. There's a newer A5X2 coming out later this year to update it (though it has repeatedly been delayed)
One thing I don't like about the A6X2 is that there is a noticeable gap between the screen and the pen. This gap isn't there (or maybe is just way smaller) on the A5X. The screen on the A6X2 is also textured, I guess to try to mimic paper, but I grew to like the gel pen feel of the A5X screen.
I would also love a device that is the size of a pocket notepad someday
Speaking from my experience with a remarkable, not on that device.
I think two factors contribute to this. One is that there are different rendering modes, and it uses a very fast one for updating pen strokes so there is less delay than you would guess by looking at larger updates. The other is that the stylus obscures the very end of the line anyways.