Here’s the Deal
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When comparing GNOME Screensaver vs XScreenSaver, the Slant community recommends XScreenSaver for most people. In the question“What are the best screen-savers / screen lockers for UNIX-like systems?” XScreenSaver is ranked 1st while GNOME Screensaver is ranked 3rd.
Ranked in these QuestionsQuestion Ranking
Pros
No pros yet!
Pro Many options to choose from
Pro Also works with xfce screensaver
...although it will make your multiscreen return to mirrors screens afterwards.
Pro Has a good security model
Runs as a daemon with non-root display modes.... See here.
Cons
Con bad
It sends you to a link with no download page
Con Bad security design
Xscreensaver does not grab the keyboard immediately and in all cases. It also does not blank the screen immediately after an unsuspend. This means that a) you might post your password in a chat if you had it focused before the screen lcoked, b) anyone can see your screen if they just open your machine.