Age old question/suggestion, lol. Been using Avast for 5 years, never had one bug.
I agree with this guy, I have used Avast for the past year and haven't had a problem.
I don't mean to sound rude, but you'll never get a definitive answer. Best is relative, its all a matter of opinion.
I agree with this guy as well.
I find Avast useful for most things, but I do find the BEST antivirus to be common sense... I do NOT click on a website link that tells me to "Click here and remove the 593447893872432 viruses that just magically appeared on your PC!!!", and if I download a torrent I make sure there are plenty of comments and upvotes for the torrent to verify it is safe.
Common sense in ALL aspects of life is very valuable.
Not to mention I can always remove any infections if needed, or at worst nuke the OS and reinstall everything.
*granted I actually find that entertaining hahahaha*
Woooow, I am a dork haha.