Which OPS system best supports to the security system?
I think LINUX would be better to support any kind of high level security system.

Back Track is on the top at the moment. It is one of the Linux distribution. It provides a rich development environment. It provides a wide variety of security and forensics tools.

Well the best protective operating system I had experienced so far is linux. I won't trust linux with my business informations. Windows OS versions are good for entertainment and a lot of other activities and not much for security.