I use a combination of Joplin and a physical notebook for my ‘waste books’ (although I don’t call them that). I prefer a digital version for most things because it’s easier to take note of URLs and photos, for example. Joplin’s browser extension and mobile app make it super useful for capturing fleeting notes that I can work with later. I prefer the physical notebook for meetings, as I find it’s 1) less distracting, and 2) I like the second review when transcribing the notes into Obsidian.
I realised that both are ‘waste books’ because the ultimate goal of any notes I take in both of these formats is to be deleted.