There are a lot of spinners on the market, some are OK and others are just plain junk. If you are asking why The Best Spinner isn’t in this comparison it is because currently TBS is not producing the results we need for higher quality spins. Sure you can hand tweak your articles to be perfect, but in our business time is money. The less time I have to spend on tedious tasks is more time I have for making money. While no spinner will produce perfect results, these two do a great job of getting you closer to human readable content. To us that means content that reads in a linear fashion with proper verbs and nouns. So below we will show the results of spun articles by these two top spinners.
Spin Rewriter 5.0 technology was a previous edition that allowed their clients to use the basic article rewriting system.  Their newer versions over the years have just kept getting better and better.   The new Spin Rewriter 9.0 technology gives you the option of assigning variables to your content.  Their software is dead easy to use.  In just three steps you can have up to 50 uniquely spun articles.
If you have not used a spinner before then I would suggest that you first use something that require more human imput like The Best Spinner or Spinner Chief in order to understand the basic principles. However if you must go fully auto then I would suggest you go for Wicked Article Creator. I have it and understand it is similar to wordAI but a one off fee of $47.
I've ranked websites in the past with spun content, and now they are still on #1 position of google. First year (2014) google found me because my spun was really bad, many paragraphs were just copied and my position drop from #2 to around #20 after a panda update. Later I cleaned all my text with better spun (I didn't buy any article!), my ranking went up again, and with more backlinks I reached #1 and it is still there 

Rewriting is far more complicated than many would like it to be. Do you struggle with your rewriting skills and wish to excel at paraphrasing? More than a desire it’s a necessity to most people. It’s an essential skill that many people need to get through their schools, colleges, universities, and jobs, now and then. Many people have to do it quite often which makes it a dull and a difficult task to finish. Moreover, searching for the suitable synonyms or phrases and then rearranging all the sentences is not always a fascinating job. In a situation like that one can’t help but wonder what if there’s a paraphrasing tool that could do all the rewriting for them in the blink of an eye. Fortunately, it is no longer just a dream. Article rewriter, article spinner, paraphrasing tool or whatever you may call it; it is now a reality. An instant article spinner or an instant paraphrasing tool, as the name suggests, can paraphrase your article promptly.
4. Tier 2 content (content that is keyword rich and relevant to your niche. Doesn’t have to be all that readable, it just has to be indexable by a search engine.)– Here put same options as with the Tier 1 content situation with the only difference that you set the 1st input to “Regular.” It is important that lower tiers have a lower quality of content compared to upper tiers.
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