Any lossless codec should be equivalent to the other in terms of quality. That's the whole point -- there is no loss so no change in quality.
If you want to use iTunes I think the best solution long term is to go with ALE. There's supposed to be some plugins to enable FLAC on iTunes but I haven't seen absolutely glowing reports.
[Xiph QuickTime Components (XiphQT)|http://xiph.org/quicktime/]
[How to play .flac files in iTunes for Mac|http://www.simplehelp.net/2007/09/20/how-to-play-flac-files-in-itunes/] - link broken
[http://arstechnica.com/apple/news/2008/08/use-fluke-to-add-flac-files-to-your-it unes-library.ars] - link to Fluke in article broken.
Play .wma, Ogg, and FLAC files in iTunes. - [http://www.macworld.com/article/142096/2009/08/play_wmaoggflac_itunes.html]
The links above for Fluke are broken but you can still find it at: http://mac.softpedia.com/get/Multimedia/Fluke.shtml
Thanks for your quick and helpful reply :-)
So, really, converting from FLAC to ALE I lose nothing? NO-THING??
In that case, I should do that and use iTunes, shouldn't I?
Unless iTunes plays at a lower quality than the dedicated players? Does it?
And if I want to batch convert .flac to .ale (I'd rather do that than have plug-ins: once converted, they stay converted)?
I've been using Switch, which only supports m4a.