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.

SpinnerChief 5 has super-advanced functions such as auto-grammar fix, for example it will correct "a apple" to "an apple," plus it can spin "I want to eat the apple, orange and banana" to "I want to eat the banana, orange and apple." We can't list all functions here, there are too many to list! - But one thing is sure, SpinnerChief 5 will give you the best rewritten article - no other spinner can do what SpinnerChief 5 does!
Its guaranteed that this tool will make rewriting jobs a lot easier than before because you can finally take a rest and let the software do the job for you. This is a wonderful tool indeed, and rest assured that everything will be perfect as long as you only use this tool for the sake of rewriting articles and not for changing a content thats the same as the article that you need to write and not rewrite. Expect that you will be able to make things a lot unique for the rewrites that you do with the aid of this tool because you now know how big its database is.
And then there is the amount of time that it takes to create content with this software. I have had past experience with text spinners and although it might seem like a fast way to write content, it often isn’t! By the time you have chosen a piece of content (or multiple pieces of content to blend together), put it in the software and produced content with this software, you could instead have created content that Google loves.