I can say that all aircraft comply with the rules. It depends on the moment during the flight. Large aircraft have more efficient engines, particularly with regard to noise. These are high by-pass ratio engines. They are less noisy, but that depends on power levels. It changes in flight, depending on the flight profile. This is probably less variable in the case of small aircraft. There are fewer maximums and variables in total.
On December 7th, 2010. See this statement in context.