What antivirus software works best for you?

What antivirus software do you use? Which one works best for you?
I’m an advanced computer user and tried many different antivirus software over the last few years. From my experience I can tell that NOD32 antivirus system is one of the best out there. It’s very light, fast and reliable.
Norton antivirus? Sucks out too much resources from my system and kinda slow.
McAfee antivirus? Even slower than Norton.
I’m telling you. Try NOD32 and you’ll never go back.
How about AVG software? I’ve been using AVG for years. It is free.