Refer to reports on vulnerabilities and how fast they are fixed (sometimes statistics is the only language tey undersand).

For example:

http://secunia.com/ shows that Ubuntu 8.10 (latest stable version) has 0% unpatched advisories (0 of 41 Secunia advisories: http://secunia.com/advisories/product/20299/) while at the same time Vista has 10% unpached (5 of 51 Secunia advisories http://secunia.com/advisories/product/13223/).

It's funny to mention there is no police in Russia, It's actually called militia :)