Same, iOS Notes all the way. Adding this because I didn't know about it for awhile and maybe someone reading doesn't know - iOS notes includes a pretty good do

Same, iOS Notes all the way. Adding this because I didn't know about it for awhile and maybe someone reading doesn't know - iOS notes includes a pretty good document scanner with the iphone camera. Open a new note and press the camera icon, you can scan multiple pages with the camera and it turns it into a reasonable PDF.