Remarkable 2. For me, it's worse than pen and notebook, since I can search effectively in neither and the writing experience in the latter is much better. Tags aren't a replacement for search in notes, the screen is quite imprecise at times, the cloud sync is paid, and a lot of the features that would make it more than a paper notebook are missing imo (better overview over my notes and annotations, lack of infinite canvas for PDF annotation means I have less space in the PDF than with a printed one, etc.).
Look at Onyx Boox eink tablets. Driven by Android, there is huge flexibility in SW usage.
I use notes and text highlighs in PDFs daily. Its easily indexable.
I would recommend Supernote instead of Remarkable, as that can sync the notes via Obsidian.
I had a R2 also and was thoroughly disappointed with it from an e-reader perspective. Not easy or straightforward getting files on the device and so few file formats supported.