You've got to be kidding. Check the graph.
I'm not kidding. This graphs is a classical example of data falsification. Solaris is actually a pair of quite distinct OS-es: the classic big-endian SPARC one and the newfangled little-endian on x86/x64. They have significantly different security profiles.
Are you by any chance trying to say that I falsified data?
I pulled it from a source that should be much more credible than your words. Saying that they have different security profiles doesn't make them secure.
Now, why did someone even mention this?