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

WordPress SEO (Yoast)

Stallion WordPress SEO Plugin

SEO Ultimate

Greg's High Performance 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?