If you are much concerned about computer's memory, then vipre antivirus is better because it uses less computer resources and has a good anti-malware programs.
but if you are operating in a dangerous environment and need a highly effective antivirus suite Kaspersky Pure is best, it also offers many other features compared to vipre antivirus like Data Encryptor and File Shredder.
The pricing for Vipre is $39.95 and price of Kaspersky Pure is $79.95
Result-According to price and you needs Vipre is the antivirus suite you will need