While it is true, that macOS malware is comparatively "rare" compared to Windows, that does not mean it is not a concern. The best defense against malware, regardless of OS or platform, is online behavior. Even the best behaved online patrons have fallen victim to malware threats, regardless of platform, so don't assume you are completely safe.
See this:
https://www.pensar.co.uk/blog/are-macs-more-secure-than-pcs
And this:
https://searchenterprisedesktop.techtarget.com/tip/Comparing-macOS-vs-Windows-security
I personally don't run any anti-malware program on my systems, and I only use the default Microsoft Defender on Windows. However, my online behavior is typically risk adverse. I don't got to questionable sites, I check for expired certificates, rarely click on links in emails, and only download executable code from trusted sources. I try to get all of my software from the Apple Mac Store, and I use zero plug-ins or extensions in my browser. Even after all of this, I know I am not completely safe.
Only you can determine if you "need" an anti-malware program. macOS has a number of built-in protections against known malware threats, and if you only get your software from Apple endpoints, you risk should be fairly low. The key here is "known" threats. The biggest vulnerabilities for macOS lie in the zero-day realm.
Good luck!
Rich S.