Wordpress SEO plugin

Hi guys,

I'm curious what WP plugin do You use?
I can't really decide which one to use, I hope you can help me.

only two that i use on all my sites are

all in one seo
xml sitemap

I use the All in One SEO plugin which configures titles and meta tags. I also use the Google XML Sitemap plugin but have run into some issues with it on recent sites. I ended up finding a fix by adding something into my .htaccess file. But that only worked for one of the sites. I had to install a different sitemap plugin on another site, I have no idea why. If you have trouble getting Google XML Sitemaps to generate a sitemap that webmaster tools can read let me know and I'll look up which one I ended up using.