I wouldn't recommend the iPad for writing, it feels horrible bc of the slippery glass and I also didn't like the feel of the Apple Pencil 2, using it for a longer time made my hand hurt.
I have a Remarkable 2 but will switch to Boox Note Air 3C soon bc the Boox has colour and a frontlight and runs on Android. However, writing on the Remarkable feels amazing and I only have to charge it once every two weeks. So if you don't need a colour screen or frontlight and are happy with a device that's only for taking notes and nothing else, the Remarkable definitely seems like a good choice.
I initially went with the RM2 when I was looking for a note-taking e-ink device because people said the writing feel is the best and I actually just wanted a note-taking device. Used it for 2 months and really enjoyed it but over the course of using it, I noticed that I actually need a front light and would also enjoy being able to easily read e-books (without having to remove DRM first).
So I ordered a Boox NA3C and returned the RM2. I sometimes still miss the UI of the RM2 and it took me some time to get used to the NA3C because it's so much more complicated, but now I really love it and am glad I made the switch. The colour is a welcome addition, my notes look so much more structured now and are easier to read. And the writing feel is actually a little better than on RM2 imo.