Most of the points is not true. Mint and Ubuntu are essentially the same thing. Mint Ubuntu - Unity MATECinnamon Mint extras. Mint even uses the same Ubuntu repository. So security updates come at the exact same time. Although I agree Mint Update manager is much better than Ubuntus. It also has a better default software selection. But there ends the difference. You can install Ubuntu and make it Mint and the vice-versa is also possible.