It's better these days with code block support and now accepts Markdown shortcuts. But I haven't given it a chance since before those things were supported :)
For collaboration, Google Docs works great. I can't imagine going back to a world where mostly everyone took their own notes (or not) in meetings. Or a world when editing and commenting on a document meant mailing copies around and someone often had to merge diffs manually. Going back 10 years would be a horrible step backward for any sort of collaboration in documents.
(and before someone says it, GitHub/GitLab really isn't a good substitute because they're designed around a different use case. I actually use GitLab for one type of task I'm involved with. Given the final form will be an adoc, it's OK but not really ideal for writing.)
For personal notes that aren't handwritten, mostly anything that will produce a txt file.
I've learned not to worry about anything that isn't content during the process. It can copied, pasted, formatted, fixed, proof read, and put somewhere more permanent later, just not while I am hard at it.