It's customization within the platform is superb and able to meet the needs for both penetration testers (red-teamers included) and the clients that review the published reports. Another favourite feature is the runbooks giving purple teaming a better way to collab between the red and blue team in real time.
Testing a specific TTP as a red-teamer and input the results of a specific test and while the blue team members attaching their findings regarding alerts, screenshots or other details. This type of real-time collaboration with the blue team is highly effective for visibility to red-teamers on effectiveness of the alerting and detection capabilities while also generating easy to read reports for management. Review collected by and hosted on G2.com.
PlexTrac is a great platform for generating reports quickly and effectively but doesn't leave much room for rough notes during a red-team or penetration testing engagement. This is due to ease of using a 3rd party markdown editor with encryption for real-time collab. Review collected by and hosted on G2.com.