All in One SEO Pack and Yoast SEO are just two of the best wordpress SEO plugins you will ever find out there. Search Engine Optimization calls for a lot of dedication and finesse in delivery. And that is what you exactly get when you familiarize yourself with the workings of wordpress SEO plugins. All in One SEO Pack is especially huge on XML Sitemap Support. They take full advantage of Google and Bing SEO facilities. This way, instead of having separate modules for various functionalities, you have all of them under one product.
A perfect example is the Google Analytics support. Of course such advanced features can be enjoyed fully with the Pro Version but if you want to learn your way about them you can also use the free version. If it does not fancy you, you can also take a look at Yoast SEO. It is one of those seo plugins wordpress that offers great page analysis tools.
WordPress SEO Plugins
#1 Yoast SEO