Which tag & feed & recent posts solution?

Hello,

(sorry to spam you tonight, I finally have the time to dig into my wpmu install )

Could you explain me the differences between the 3 different plugins to display tags :
- Sitewide tags from Donncha (i used to trust donncha's work http://wordpress.org/extend/plugins/wordpress-mu-sitewide-tags/ )
- http://wpmudev.org/project/MuTags
and the one listed here ?

Same question for rss feed / recent posts ...

I'm looking for the best performance & the one that is the most updated , as we all do