Spybot Search and Destroy's (SS&D) updater beat Ad-Aware's (AAW) for it has option which component to update and allow you to choose update servers. As we already know, both vendors are offering free support forum and if we will look into update discussions on the said programs, most of the people will report problem after upgrading the software. Many times already, the new software update has caused problem so the option in SS&D to choose which component to download and install during update check is a great option.
AAW’s updater does not allow you to choose what to update: database or program update. Launching the updater from AAW’s UI or via start menu will automatically check, download and install available updates. There’s also ongoing issue with its updater giving people “Connection error” and it occurred during this test.