There is no one best spyware software out there each has it good and bad advantage. Other use more then one when scanning there computer to see what the other have missed in the scans to be on the safe side. But the best way to avoid spyware or malware is to not click on attachments in email or popups and to know what your downloading from clean sites. But a AV program with spyware or malware program should be the two best setups to have to catch much of those programs that try to install or get through the detection. But don't forget a firewall as well this software will help you identify what could be a possible spyware or malware trying to call home.