Bitdefender is the clear winner if you are looking for an anti-virus solution that offers high rate of detection of malware and has minimal impact on system performance as well as reasonable cost. It also comes with distinct features like microphone and webcam protection that block suspicious requests to your camera or microphone.
Another important aspect is how simple it is to use your antivirus. Avast and Bitdefender both have a relatively simple interface, however Bitdefender is a little more cumbersome when it is running scans. It took us longer to find the settings we required for an entire scan or a boot-time scanning was a bit complicated.
Bitdefender’s support is superior to Avast. Its knowledge base and phone support are extensive. Avast however, is able to limit its contact options to paid customers and heavily rely on its knowledge base and forums.