Buy none, Comodo or any other freeware software is good enough. I don't use any AV and my system has not got infected. I just use Comodo firewall and scan downloaded files with virustotal, I also use a Chromium based browser which blocks malicious sites. AV's can do more harm then good.
@ShinRamYun247 You say Defender takes a lot of resources? I don't see that happening on my machine. Yet you disable it, and replace ONE program with EIGHT others. I will rely on Defender. Also, we need to get away from telemetry being a bad thing. How is MS supposed to keep up with current threats, and how their definitions impact them, and our machines if it doesn't somehow get anonymized feedback? Plus, many issues are reported with 3rd-party programs during updates, etc. They simply do not work seamlessly with Windows. But, if you wish to use 3rd-party "security" programs, that risk is yours to take.
Thanks a lot for your replies all as I've learned a lot from your inputs. I've followed the 1st advise and bought trend micro maximum security on the same day, I will keep others mentioned here in mind. Thanks
Bitdefender is a good Antivirus but also is too heavy on the system I recommend ESET (Good detection, light on system, Easy to use) You can also try ESET Internet Security with Firewall