GUILLAUMEK  "including Cocoa apps, screen savers, and preference panes. It can even update kernel extensions, regular files, and root-owned applications."

This is the interesting part, where it's better than Sparkle.

This framework seems to handle files without executables, which Sparkle lacks AFAIK. You can't currently update stuff like plugins, drivers, file systems.. in fact, for most of the stuff installed in /Library Sparkle can't help you. I think the only exception are preference panes which can check for updates by themself. You actually need a program or daemon which contains the Sparkle framework to checks for updates.

Now, I'm not too tech savy on all this so don't take my word as gospel.  
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