Which AV should I go with?

Use the Windows Defender. If you really want an AV installed then get a free one. Use this website to see which AV's are the best. Go for one that has the highest % of blocked malware/viruses.


Server Admin
I personally suggest always using Windows Defender. Microsoft within the last six months has started sandboxing a lot of executables that are run on windows machines and it works great alongside many endpoint detection and response tools.