Antispyware vendors vary based on the kernel for which they have optimised themselves. Some are very good with windows 7 and 8.1 and flatter on windows 10 64 but. Also my experience all vendors have being struggling to maintain consistency as the increase in various variants have lead to catch up my majority of them. Some have solved this problem by including machine learning and artificial intelligence at the cost of increased false positives and some have addressed the solution by increasing behaviour logic to block rather than fully remediation of the attack. If you need to choose the maze among the vendors: A) American companies prefer Symantec B) Communist countries prefer kaspersky C) European countries prefer sophos D) Japanese prefer Trend micro Indians prefer best of all above. On web tier Indian enterprise use kaspersky On endpoint tier they use symantec On server tier they use trend micro On gateway UTM they use sophos Some Indian companies consolidate the buying with few vendors with Symantec being claiming to have market share for the past few decades in India. This is due to fact that symantec addresses security at endpoint, mail, web, gateway and server enabling consolidation benefit for industry and also have a strong consumer product NORTON which is sharing intelligence to enterprise and vice versa. Sorry for a long answer to your short question. You may want to try FREE norton POWER eraser to check the power of symantec on your endpoint for antispyware capabilities and decide for yourself. Have a nice day.