アンチウイルスソフトランキング 2015年12月版
http://gigazine.net/news/20160128-antivirus-ranking-2015/
ちなみに、Microsoft Windows Defender は10位みたいです。
◆10位:Microsoft Windows Defender 4.8:星15.5
Protection:星4.5
Performance:星5
Usability:星6
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◆1位:Avira Antivirus Pro 2015:星18
Protection:星6
Performance:星6
Usability:星6
◆1位:Bitdefender Internet Security 2016:星18
Protection:星6
Performance:星6
Usability:星6
◆1位:Kaspersky Lab Internet Security 2016:星18
Protection:星6
Performance:星6
Usability:星6
◆4位:McAfee Internet Security 2016:星17.5
Protection:星5.5
Performance:星6
Usability:星6
◆5位:Avast Free AntiVirus 2016:星17
Protection:星6
Performance:星5
Usability:星6
◆5位:AVG Internet Security 2016:星17
Protection:星6
Performance:星5
Usability:星6
◆5位:BullGuard Internet Security 16.0:星17
Protection:星6
Performance:星5.5
Usability:星5.5
◆5位:Norton Norton Security 2015:星17
Protection:星6
Performance:星5.5
Usability:星5.5