As I tell others, there is no universal "one size fits all" solution
that works for everyone and there is no single best anti-virus
. Every vendor's virus lab and program scanning engine is different. Each has has its own strengths and weaknesses and they often use a mix of technologies to detect and remove malware.
Choosing an anti-virus is a matter of personal preference, your needs, your technical ability and experience, features offered, user friendliness, ease of updating (and upgrading to new program release), ease of installation/removal, availability of quality/prompt technical support from the vendor and price. Other factors to consider include detection rates and methods, scanning engine effectiveness, how often virus definitions are updated, the amount of resources the program utilizes, how it may affect system performance and what will work best for your system. A particular anti-virus that works well for one person may not work as well for another.
Here are links to some BC discussion topics with opinions from other members:avast! Free Antivirus
has been becoming more of a disappointment for the past several years and I no longer recommend it..
If folks are looking for a free alternative I generally recommend recommend either Sophos Home Free Antivirus
or Bitdefender Anti-virus Free Edition
if they prefer not to use Windows 8/10 Defender
For those who do not mind a paid for product, I generally recommend ESET NOD32 Anti-Virus
or Emsisoft Anti-Malware
as they leave a small footprint...meaning they are not intrusive
and do not utilize a lot of system resources. Kaspersky Anti-virus
is also a good choice for the same reason.
For more suggestions see Choosing an Anti-Virus Program