SEO Plugin Discussion

There are so many good Wordpress SEO plugins. I wanted to start a thread to share suggestions/tip on which is the best SEO plugin for Wordpress multisites. Each site would have to be able to have their own settings. Here are some popular contenders:

All in One SEO Pack http://wordpress.org/extend/plugins/all-in-one-seo-pack/

WordPress SEO (Yoast) http://wordpress.org/extend/plugins/wordpress-seo/

Stallion WordPress SEO Plugin http://wordpress.org/extend/plugins/stallion-wordpress-seo-plugin/

SEO Ultimate http://wordpress.org/extend/plugins/seo-ultimate/

Greg's High Performance SEO http://wordpress.org/extend/plugins/gregs-high-performance-seo/

WPMU DEV SEO https://premium.wpmudev.org/project/wpmu-dev-seo

Please share what plugin you use and what made you choose that plugin? If you use WPMU DEV'S SEO plugin, what makes it good?