We tried and we tested. We spinned and we unspinned. After all said and done here, I think you should have already made your choice about which spinner is best for you. If you will be doing a lot of manual spinning, then The Best Spinner is probably the best choice. On the other hand, if you will be using the spinner just for automatic spinning, and you have enough capital, WordAI is the spinning tool for you. But if you are still on a budget, Spin Rewriter is your spinner. However, if you are going to be spinning text in languages other than English, you might want to go with either Spinner Chief or Chimp Rewriter. The choice is all yours. You can now make an informed decision.
Cross Platform – Being a Mac user I prefer when I can fire up a program locally. WordAi is web based and therefore works on Windows & Macs without issue (Linux as well). SpinnerChief III Ultimate has a Web Api that allows spinning from the web, but we did not have much luck with it, so at this time we consider SpinnerChief a Windows only application and therefore requires me to run it in a virtual Windows Machine using VMWare Fusion. This one is a hard one to call because clearly WordAi wins cross platform, but it doesn’t have all the extras that SpinnerChief offers.
Quality readable content is key here. Google, for example, will recognize that people are leaving your site soon after arriving if they perceive that your site or blog is full of junk content. This is called "bounce rate." If your bounce rate is high, then people are quickly leaving your site. But for the sake of your business, to build your online reputation and brand, you want people to visit your site, stay for a while, and then keep revisiting over the long term.