Apple Lossless, AIFF or WAV for itunes?

Since you said "for iTunes" you won't use FLAC unless you use
a third party player software that works in tandem with iTunes since iTunes
does not directly support FLAC. my choice would be AIFF or ALAC
because of the metadata support and I personally do not hear a difference
between any of them.

I use AIFF. Haven't spend much time comparing the different formats because I find this sort of A/B testing tedious. AIFF seems to be a nice compromise between tagging ability and lack of compression. General consensus seems to be that WAV has the potential for best fidelity while FLAC/ALAC may not sound as good. Storage is so bloody cheap why bother with compression at all? I mean, this is a site dedicated to maximum fidelity, correct? What's a few hundred bucks extra for storage capacity in the context of a most of our systems?

WAV. I have a WAV album downloaded from Juno that sounds much better than a FLAC rip through my Naim DAC. In fact, I'm astounded how much better it sounds. Only if WAV was more readily available to buy.

@Macdude

If you are comparing a download (WAV) with a CD rip (FLAC) you may well be comparing much more than the difference in audio codecs. They might be entirely different masterings or mixes. Unless you could be certain they are from identical sources you could not be sure.

You could rip your CD to WAV and then to FLAC and that would ascertain a valid comparison.

@Mwheelerk

I have compared flac vs wav rip of the same CD on my Naim dac and wav has more immediacy to it.

I was curious to how a purchased wav album sounds so different than my CD wav rip. Like you said, could it be a different mastering or conversion process to wav?