The best options are usually the curly cord style earpieces which are often subtle, reliable, and responsive, whilst being safe for use in physical situations. Most teams use a mix of in-ear headphones for discretion listening only, where supervisors and key members opt for combination radio microphone headsets.
For a basic system setup, start with two way radio headsets that have a comfortable ear fit and a robust push-to-talk button, with compatible connection to your radio fleet. For more extreme use-cases you could look into Peltor headset military system, as they can be one of the best options for security teams working in extreme environments.