What is better?

Hi guys!
I have a tricky question. What is better in terms of SEO: to have 7 articles with 300 words each or one big article with 2100 words?
I have an article that speaks about 7 people but they all have something in common. Should I divide and make long tail keywords by their name for each or should I compile them in one big article? Which one of the methods do you think google appreciate the best?

Thanks for your time!