I considered all the options back in 2021 and went with the iPad Mini.

My reasons: much better software for sketching, not bound to a single ereader app, multiple ways to send stuff around, perfect size.

Many years later, I would still choose the same. I use it to annotate webpages, sketch, read books and read queued articles in instapaper. It's distraction-free but still connected. I can Airdrop drawings or load my handwritten notes on the Macbook app. Tap to define is so good I've absent-mindedly tried it on a paper book.

The LED screen is great for some things and bad for others. You have to turn it on and unlock it. You can't SSH into it or sync your drawings as simple files. Otherwise, it's really good.

I like using my iPad better than my RM2 for similar reasons (I have both, but really only use the iPad anymore). The pickup is much better on the iPad, in my opinion.

However, one thing that I think makes the biggest difference is adding a screen protector. I particularly like the ones from https://paperlike.com/. It adds a layer that makes it less like writing on glass and more like writing on paper. For me, this was the biggest increase in usability for taking notes.