Both AVG and Avast have really annoying upselling techniques, even when you already bought the product there are always addons they are trying to promote. Some popups and notifications are as annoying as the ones Microsoft use to push Windows 10 updates.
Relevant quote: “It is difficult to get a man to understand something, when his salary depends on his not understanding it.” (Upton Sinclair)
In addition, if the anti-virus software annoys users enough they soon start ignoring its popups and always just click them away, so that they end up missing actual alerts.
I stick with Windows 10's built in Windows Defender on my beefy gaming rig though, virtually anything 'better' (Defender works fine for what I need it for, but it's still very basic protection) than it tends to bog my system down too much when playing games (one thing that makes me consider purchasing NOD32 for my system again, lightweight and game mode).
https://eugene.kaspersky.com/2013/05/09/av-test-certificatio...