Don't ever use Norton's software that's got something to do with anti-virus. It sucks big time, trust me.

So Kaspersky is the obvious winner here.

Anti-Virus takes action AFTER the virus is inside the computer.(usually the virus not active yet.)

As for Internet Security, you will get firewall. Which means the virus is prevented to even come in your computer. Plus, you'll get more security features in Internet Security suites like anti-phising, parental control and so on. Do note that the usual anti-virus function is still in the Internet Security suite.

The certainty of the above information may not be correct. Anyone is welcomed to correct me.