Apple Thoughts: iPad Handwriting Apps Review

"Apps that allow users to handwrite on their iPads using a finger or stylus have become increasingly popular, which suggests that the iOS keyboard is not always the best tool for a job, and that typing may not have fully eroded the need for decent handwriting."

I settled on Notability for my needs, since I work mostly with PDFs and I like how it organizes files. What are your thoughts on this lengthy list of apps? Which one or ones do you use?