Professional pilots wear watches such as the Garmin D2 Delta. Traditionally, fighter pilots will wear Casio or Longines watches. The more contemporary luxury watches from the likes of IWC and Rolex are usually just for aesthetics today, but they can still serve a purpose if needed.
A pilot watch is exactly as the name suggests. They are watches designed to be worn by pilots. Sometimes referred to as an aviator style watch, they feature large faces, typically 40m+ that include highly legible, even oversized indices. These watches can also withstand dramatic changes in temperatures and pressure. The back of a pilot's watch is designed to be protected from magnetic fields.
Pilot watches are watches for aeronautical use, they typically feature a larger bezel with larger indices. Traditional Diver watches have a higher level of water resistance of at least 10 ATM.