avast!'s great scan speed only 8'13'' , contrary to Kaspersky (3h49'23'')
For sure they are not scanning the same things. You're comparing apples with oranges.
I just do not agree with (at least) one phrase of the article:
In the end, choosing between a paid or free of charge antivirus depends entirely on your needs and computer usage knowledge.
To use the free avast antivirus is both a sign of knowledge and wisdom