Maybe better overal compatibility of CBR?
Otherwise I don't think there is any definite objective recommendation.
I personally would use FLAC for 24bit lossless or MP3 CRB 320 for lossy variants.
Others may preffer other choices, but I hadn't had any problems when using 320kbps CBR MP3s - both compatibility and quality wise.
Anyway, you can do your own blind AB test using WAV, FLAC and 320MP3 to find out if you are able to spot any real-world differencies between those formats.
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