To be honest, I wouldn't put AV on anything but Windows. There I'd opt for Microsft's Security Essentials since it's the least offensive/annoying solution. On

To be honest, I wouldn't put AV on anything but Windows. There I'd opt for Microsft's Security Essentials since it's the least offensive/annoying solution. On mac and linux I just don't see the need unless you're doing questionable things or trust shady sources. Be aware that macOS also comes with a very basic and rudimentary protection built-in called XProtect.