Avast IS is a very good antivirus with a variety of features but when compared with kaspersky I would prefer you to use kaspersky because bcz it is intelligent virus destroyer it uses a variety of tasks to safe your computer from viruses like Trojan horses and droppers. avast have features kaspersky have tricks!
kaspersky uses big amount amount of your computer memory with lot of security while avast use less memory and provides less security!
now choose what's better!
MY FAVOURITE ANTIVIRUS IS BITDEFENDER TOTAL SECRITY!