Most companies here use McAfee or Kaspersky, I'm seeing a trend to move to Windows Defender ATP.
So far only helped one company move to Windows Defender ATP in it's entirety and has been successful. It lowered costs and compatibility issues, especially when this specific company used McAfee that caused lots of issues with Windows 10 Updates (contrary to Kaspersky, which hasn't caused any issues so far).
Enterprise Security Tools are more advanced and expensive, cause companies are targeted by more advanced malware.