Everyone makes their own choices on software and malware protection.
I've used Paid suites: Norton (until it became too big, too hungry, too agressive), Kaspersky, and
Free "suites": AVG, Avast (current). All worked well.
Take a look at AV-TEST - The Independent IT-Security Institute: Home
for more testing results.
Use the column headings to sort on protection, repair, and usability (I focus on protection & repair).