I'm currently running Bitdefender, there's no real good reason for that except the license for it was a cheap offer. There are some antivirus test like av-test.

I'm currently running Bitdefender, there's no real good reason for that except the license for it was a cheap offer. There are some antivirus test like av-test.org and av-comparatives.org and no doubt others. Personally I think an adblocker and, notdownloading anything illegal and a decent spam filter are more effective. The last time I had a virus was 10+ years back.