With the free download version, Both, AVG and Avast are most downloaded security software programs on the Internet. So before choosing anyone between them, first get here comparison report of AVG and Avast on the performance and features basis. Here we are comparing between only free versions.
Avast vs. AVG (Features comparison):
First start from comparison of both antivirus installation steps.AVG comes with some additional third party bundled toolbar software which is optional as part of the installation. You need to go for a custom installation if you do not want the link scanner feature to be activated. Whereas Avast requires you to enter your email id for license key activation.
After successfully installation, AVG will not ask & force you to restart your computer and it also does not need your email id for generating a license key, it done automatically. Whereas Avast suggest & force you to restart computer and you need to enter your email id for the license key and activation.
From security point of view, AVG is free for personal and business use and offer antivirus for free virus removal, anti-spyware, anti-dialer, anti-phishing, signature based and heuristics based on-demand scanning, email protection and real time protection. Whereas Avast also offers same features as AVG free version provides. But Avast has some more extra features which includes the behavior blocker, p2p protection, intelligent scanner, network shield and chat protection. So from security point of view, Avast is much stronger than AVG.
AVG vs. Avast (Performance comparison):
After features & security comparison, now take a look of performance comparison between them. Avast and AVG, both offers full & customized scan facility and both offers right click and scan facility. But AVG use more memory than Avast for full scan but the AVG scan is quite faster than Avast.
After overall conclusion on that, I find that Avast free is better than AVG free because it offers some extra security features than AVG. And we are discussing here about AVG and Avast which offers protection against all kind of threads, so security point of view I would be recommended to Avast free is better than AVG free. But this is my personal opinion.
Also find here comparison between McAfee vs Norton and Once again analyze before choose between them.