I tried a lot of stuff, including iPad and Apple Pencil combo for full handwritten digital notetaking experience, graphic tablets, etc.
Finally settled with the following -
1) Most of my notes are typed in Notion because it's just quick. If I get exhausted typing on my PC, I can pick up my phone and continue from where I left off.
2) For marking up pdfs and taking notes within pdfs, I use my iPad and apple pencil combo. You can supplement this with a graphic tablet that works across PC, mobile, etc.
I decided against buying a graphic tablet because it wasn't as accurate and intuitive as I was expecting it to be. That might not be everyone's experience so please take my comments with a pinch of salt. It is also possible that my experience with graphic tablet was bad because it was one of the cheaper ones. Maybe expensive ones perform better