Contributed By: Cliff Hobbs [MVP SMS]
Reproduced from the Microsoft Software Update Services: Frequently Asked Questions web page:

http://www.microsoft.com/windowsserversystem/sus/susfaq.mspx#top

"See Choosing a Security Update Management Solution where you'll find a table that highlights differences between Software Update Services (SUS) and Systems Management Server (SMS) in the area of deploying critical updates."