Answer Posted / syncopator

Either of them may be considered "good" dependent on the service provided.

In the medium frequency broadcast band (535kHz to 1700kHz) a.m. is chosen because of its relatively narrow bandwidth - about 8kHz, so that many stations can operate in that band.

In the v.h.f. broadcast band (87.5MHz to 108MHz) f.m. is used so that the wider bandwidth necessary for reasonably good transmission of music, plus a 38kHz sub-carrier for stereo transmission, may be used.

In the aeronautical v.h.f. band, a.m. is used. This is to avoid what is called the "capture effect" of a stronger f.m. transmission overriding a weaker one, which could mean that a weak signal from an aircraft in distress might not be heard.

So, both a.m. and f.m. are "good" for broadcasting.

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