When you create articles, you’ll be writing reviews. The review should be keyword rich, so if you’re going after a competitor you should put the competitors name in the title and a couple times within the article itself. The trick is to not be too offensive. Write an honest review and sign it with a fake name, so it doesn’t trace back to you. But you want to find reasons that your company is better than theirs and simply point out the differences. If they’re very well known, you can mention that their customer service is worse than yours because you’re a smaller company, ready to make deals. Etc.