Difference between different world protection plugins

As far as I know there are 3 best plugins for world protection: GriefPrevention, WorldGuard and CoreProtect. Which one is the best to use and for what purposes?
Which one do you suggest for small SMP vanilla whitelisted server with no regions so it would be easier to fix the world if it would be griefed?
Thanks.

 

@synalice
GriefPrevention: I do not know anything about this plugin, so I cannot praise or criticize it.
WorldGuard: This plugin protects against certain actions within a specified area (region), such as breaking a block, placing a block, interacting with a block, entering a region.
CoreProtect: I do not know much about this plugin, but I know it has a useful feature for rolling back areas by a specific amount of time.

If you do not want any regions, and want to be able to recover griefed areas, I would recommend CoreProtect for its rollback feature.