Well KGB Archiver claims to have much superior compression over WinRar or 7zip or any others of them, but when I ran a test by compressing a CD ISO with KGB and WinRar, the latter one actually left KGB too far behind, so go figure.
I would recommend just WinRar, it is easy to use, can compress very good, and can put a recovery record of up to 10% of the archive space into the archive, to restore data if the archive was damaged. But if you really need every squeezed inch of saved space, then WinRar is not the optimum yet.
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