"Digital just sounds clearer" is true right up until it isn't true at all. The real story is how each technology fails, not just how it sounds while it works.
Analog land mobile radio (LMR) transmits voice as a continuously varying waveform — the electrical signal itself is a direct analog of the sound pressure wave. Digital LMR standards like P25 and DMR instead sample that voice, run it through a vocoder, and transmit it as a stream of encoded bits, which the receiving radio has to decode back into audio. That single difference — waveform versus data stream — is the root cause of everything else in this comparison: how each one degrades as a signal gets weaker, and what extra capabilities each one can and can't offer.