When it comes to note-taking, I prefer apps that are lightweight and easy to use. I want to be able to quickly open a note, capture a thought before it disappears and then move on. Recently, I've ditched iOS Notes and have been using NotesTab from Fiblab. NotesTab is a universal app, but I've been using it primarily on the iPad because I find it easier to take notes on the slightly bigger screen of my iPad mini.
NotesTab uses a two-pane interface to display a list of your notes on the left and the contents of individual notes on the right. You can easily switch between landscape and portrait orientation and keep this same layout. You can also fullscreen an individual note if you need more space for writing.
Notes are plain text and there is no drawing or