I just started using Nebo (24 hrs ago) and it has become my new favorite Apple Pencil writing app. A lot more user friendly and powerful versus Apple Notes or Notability.
When regularly typing notes, I like Bear for its Markdown ability, not to mention all the bells and whistles.
Day One is good for journaling.
I also use Cheatsheet on my Apple Watch
For writing books, I use Ulysses and Pages.
I use several different note apps depending on what I am trying to accomplish.