Two must have feature of personal knowledge management app for me are:
1) Pasting web page excerpts with non-text resources (images, animations) included as a copy (and not just as a url reference that might not be avaliable anymore in the future).
2) Quality full text search (across all notes or just a sub-section)
Many knowledge management solutions have trouble with these two, so they are the first things that I usually test.
Trilium Notes can do those very well. The first one being done with the web clipper extension.