Always start with the best 10 words to get someone intrigued.
I read this today. We write lots of words, but people scan for things that catch their interest so that they read on.
There isn’t a right or wrong answer to how long your message should be, the only thing that counts is to write something genuine. Our words aren’t for everyone, but if we play games and manipulate to get attention, you’ll have to keep playing games to keep people looking. Long term it doesn’t work as the readers work it out and move on.
10 words that are authentically us is better than 10 words to get noticed.