To add to my prior answer: whenever you process a URL with Hook, it adds a bookmark for it. That means you can find it later via Hook’s search tool. Pinboard has a tag and note field that Hook does not yet have. And Pinboard makes your bookmarks available from iOS whereas Hook is not yet on iOS (our iOS app is still in the works).
However, with Hook, you don’t have to remember to bookmark something. It’s automatically bookmark whenever you Copy Link, Copy Markdown Link, Hook to Copied Link or Hook to New — which are all signals of relevance.
E.g., if I share a link with Hook, or just copy a link into my task manager, that implicitly signals “hey, this is worth bookmarking”.
Personally, I use Pinboard , Hook and a launcher. Having said that, many of the things I used to do with Pinboard and a launcher I now do with Hook. Hook’s bookmark search tool is surprising useful for rapidly surfacing pertinent information.
We’ll have some pertinent / surprising new information to share in April on the subject, with the next major release of Hook.