I wonder if Agile Tortoise’s Drafts might be interesting. It’s Mac world only and not, unfortunately, made for Android.
I use it all the time to capture links, comments, thoughts. What makes it really powerful is its extensive library of actions, predefined and highly customizable (and scriptable, though I haven’t gone that route).
I tend to use it for links to articles, with or without my own comments, and new texts. One can append text to previous notes as well. I just saw that someone has made a script to create hashtags from selected words, which would be useful for tagging—especially with the stamp code offered by Tinderboxers here to grab hashtagged words as tags.
Now if there only were a cross-platform option…