Doing some quick math, that means Windows PCs have a threat-detection rate of almost six times higher than Macs. Trojans pose the greatest threat to Windows users. As for riskware, Surfshark reports around 67,500 detections on Windows and 5,400 on macOS. Riskware refers to programs that are generally legitimate but which, due to their functionality, may pose a security risk. While phishing is the third-biggest threat to macOS users, according to Surfshark, it plays only a minor role for Windows users.