Watch Nicole's great overview and rubric, rating:
Obsidian
DEVONthink
Readwise Reader
Skim
Zotero 筆記軟體 - all boxes checked
She may be wrong about DT but it's a cautionary tale.

Pros

• Deep linking into PDF by page number

Cons

• The Obsidian plugin - Annotator｜PDF註記插件 is limited to two ways: highlighter on text and textual annotation. Selecting text is nightmarish on the iPad.

Note-taking