It is always has been remained as a debate on the baord thinking articles are the key tool for content generation and its marketing is very difficult for the threat lies on the copy rights.
Unique articles help to bring traffic to your website as people might get attracted but if they keep on seeing the same stuff it won't matter to them at all
Unique articles best for your site,because if your site article content is unique and fresh then your site will getting the good traffic in search engine.
People search the web for information and one way of getting their attention and acquiring their trust is giving them unique and informative content/ articles. Posting unique articles drives more readers and traffic to your website.
Using unique content is more important in search engine optimization process.In Article submission method, unique content articles will give good traffic to your site.
Every search engine likes only unique content because their motive is to provide good information to its users and give high rank to the site.Thats why unique content is required.
Unique article can help for increasing your keywords ranking as well as traffic on your website.if you use the fresh and unique article it also increase your reputation on internet.
Content of any web page is more important for getting the benefits of article submission.If you use the duplicate content it degrades your presence on internet.So for getting the traffic as well as ranking always use the fresh and unique content.