The lapel mics, provided they have been mounted properly do give a drier sound, and if you are working on a noisy set then they are definitely easier to work with in post. If you have a quieter set then the boom mic will sound a lot more natural. If a film has a bigger sound effects/design budget then lapel mics can be more popular, as it means less original room acoustics to contend with, and matching takes can be easier. Lapel mics can also be more popular on green screen shoots, as the set has absolutely no relationship to the final shots in any original room tone/acoustics is not desired.

The lapel mics, provided they have been mounted properly do give a drier sound, and if you are working on a noisy set then they are definitely easier to work with in post. If you have a quieter set then the boom mic will sound a lot more natural. If a film has a bigger sound effects/design budget then lapel mics can be more popular, as it means less original room acoustics to contend with, and matching takes can be easier. Lapel mics can also be more popular on green screen shoots, as the set has absolutely no relationship to the final shots and any original room tone or room acoustics are not desired.