Security: gnome-screensaver VS. switch user

[erikmccaskey64]

People "usually" suspend their laptop, so that they can continue their work when they open the laptop. OK!


Two choices [GNOME]:  


1 - Menu -> Shut Down -> Suspend
in this case, the gnome-screensaver locks the PC. but the gnome-screensaver is just a "normal process", and it could be killed e.g.: 
http://securitytube.net/USB-Autorun-attacks-against-Linux-at-Shmoocon-2011-video.aspx
or using any method [video was just an example!!].






2 - Menu -> Log out -> Switch user -> Suspend
in this case, the GDM [???] protects the user [i mean it locks the PC from other users]




Which one is more secure/safer?
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