The two registration paths differ in what a single registration covers, and that is the practical difference for anyone with more than one airframe. Part 107 registration is issued per aircraft: each airframe gets its own certificate and its own number, and each number must be marked on the exterior of that aircraft. Recreational registration is issued to the person, and the single number covers every aircraft that person flies recreationally. So a pilot with five aircraft holds five registrations under Part 107 and one under the recreational path. Both carry the same modest fee and both are valid for three years, which is why options built around fee or duration differences are wrong. The distinction matters when a fleet grows or when an aircraft is sold, since the registration follows the airframe under Part 107 and must be cancelled or transferred accordingly.