WP had unbeatable table of contents, footnotes and index generation at the time - far better than Wordstar, and Word.
In my opinion it was miles ahead of Wordstar and a bit similar to what is now HTML tags.
The macro language of wordperfect 5.1 did let me add auto-correction for common typos.
And some other things like: if typing a comma after a space, move the comma to be before the space, and the same for dots.
I'm sure wordstar was nice, but for me it was just not as powerful.