The kind of notes I'm mainly after storing are learning notes. For example when I did my Red Hat course, I used Evernote. Evernote is really good, styling is easy, it looks great, I can share it, putting pictures in (big points) is easy - but one of the major drawbacks is it's a pain to insert code blocks. I use Markdown for more code-oriented notes, but putting images in to Markdown is a pain and it's just a format, not a service (whereas Evernote syncs to all my devices etc).

Just thought I would see what the HN community uses. I'm currently learning Puppet and taking lots of notes, I started with Evernote but then realised I wanted to insert lots of code blocks, so I swapped to Markdown and now realise I want easy inline images and the ability to share to all of my devices without having to do something bespoke or use Dropbox/G drive etc.