Audio File Load Type Setting

Can anyone offer some advice on the effect of the various “Load Type” settings (Decompress on load, Compress in memory, Stream from disc) when dealing with WAV format audio files? Specifically (if it matters), I’m dealing with a project targetted at iOS devices.

Was just about to ask this and realised I’ve asked it before.

Specifically, in what format should sounds be stored for a mobile platform project?

Which “Load type” is recommended?

I’m currently using WAV format for all of my sound effects and MP3 for menu music.

Given that the WAV files aren’t compressed, is “Decompress on load” irrelevant? Or does Unity store the final audio in another (compressed) format, and therefore “Decompress on load” does apply?