Antivirus Firewall Software

Do I need a separate AntiVirus/Spyware software package if I already have windows defender and windows firewall

i currently have norton 360 and im wondering if there are other software that are better, I do alot of online shopping and banking, so far norton has worked fine.

I downloaded Panda from the Internet and when the free version run out I purchased the paid subscription. The paid version just does not seem to perform as well as the free version. Any suggestions would be appreciated.

Is Windows defender a good one?