Hello, a VPN is not a substitute for antivirus software.
Using a VPN will hide your IP address and allow you to access geo-locked content, among other things. If you are planning on downloading Torrents, then it is advisable to have suitable antivirus protection.
I don't have much knowledge but if you go with some renowned VPN like surf-shark or NordVPN it gives you an extra layer of security against cybercriminals or you can easily access geo-blocked content in your region.
No, while these two services can contribute in similar ways, it is important to remember that both off unique protection features for WiF users that often means that they are best used in conjunction with one another.