Vote for your favorite antivirus
Please note that Malwarebytes and Microsoft Security Essentials are considered as second antivirus beside the main.]
Personally I've tested and used almost all antivirus and Internet security software but I loved ESET Smart Security (currently testing v7 beta) and Emsisoft Anti-malware 8
only bad thing about Emsisoft its has a lot of pop-ups on every thing that tried to run or connect to internet to be honest its a nice feature but for me I don't like it I see they just can let the known and used to run or connect, and unknown applications ask me
also Emsisoft has an amount of false-positives like Avira.
However, Emsisoft can deal with the latest viruses and delete them well. beside both Emsisoft Anti-malware and ESET Smart Security are light on resources.
Antiviruses choices are always depends on personally usage. and that's only my opinion.
Please if you could include some information about your preferred antivirus why you like it, things you like on others and things you don't like.