FLAC is preferred, but I use both.
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FLAC
MP3
Both
Neither
I always use mp3 just because its more compatible with everything.
since i don't have aperion speakers, mp3 sounds just fine on my system. and i only have about 1 TB total storage, so having everything on flac would be impossible.
i always use mp3
file size is small compared to flac
if there is freeleech for a flac, then i will certainly give 1st preference to flac