I don't believe there is a single "better" Anti-Virus application.
Personally, whenever I have to scan a system, I use F-Prot, on a DOS floppy disk. For me, it's ideal, since I can scan a unmounted filesystem, which eliminates any virus which may be run in memory when a system is active.
But, no single Anti-virus app will catch every single virus.
It's always best to take precautions to try not to get infected. This will mean to Not use Internet Explorer, and Outlook Express, which greatly contribute to one getting infected.
I never run any anti-virus software on any Windows systems I use. In the last 12 years, I've only gotten infected less than a handful of times.
But for most of the time I am on the computer I run systems which are immune to infection. (Unix, Mac)
There is a list on the forum for a bunch of Free anti-virus applications
http://www.oldversion.com/talk/showt...ght=anti-virus