Windows 10 with Anti-Virus Security package or Linux Mint with no security package - Which is more secure and why?

If Linux is more secure is it because Linux was designed with security in mind? Or because it's usage is so low compared to Windows that hackers don't really try to screw with it too much?
Update: Update: Stupid questions. Are there antivirus programs for Linux?
Update 2: Never mind about me asking about the AV. I just Googled it and saw several.
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