I used Scrapbook for years. A nice thing is that even if I stopped using it I still have all the files I saved. There was some kind of export-function to save the tree of documents to an external index.html and I just keep that with all the other files in my hoard and can navigate all my old saved pages.

I switched to SinglePage since I prefer to just save pages as stand-alone files. It does waste some space, but I can move the saved files to wherever it makes sense in my hoard and use my filesystem for organizing files instead of HTML documents living in their own location.

I also use the Save Text to File add-on. Often only the text on a page is useful anyway. At least that compensates a bit for the space wasted when using SinglePage on other pages.