Both security solutions are useful if you don't have any protection software on your computer. What to choose depends on what you need and if you want to pay for the software. 360 Total Security is freeware, as it is Avast Free Antivirus. In comparison with 360 Total Security, the free version of Avast doesn't offer antiphishing protection and privacy features such as protection from ID theft, but provides home network security. But if you decide to pay for your software, you should know that the paid version of Avast Antivirus brings you the most comprehensive protection.