Why would you use either? If you are importing CD's, do yourself a favor and use Apple Lossless. Its a nice step inbetween wav/aiff size and compressed. It will also take less time. Quality is outstanding.
Don't cripple yourself by turning lossless cds into aac.
i could try it. But say a 6 min song is 11.9 mb how much more would a apple lossless file be? Not that its a HUGE deal with space as i use an external hd for that. But i am wondering if its worth the extra space.
I use senneheiser HD 555'S, i would possibly notice.