It seems this is not for AIFF files.
Since you mentioned EAC, I assumed you wanted to rip to FLAC.
Is itunes a lower quality ripper?
As long as you keep error-correction enabled, you should be fine.
I agree. I didn't think iTunes-ripped files sounded quite as good in my system, but most say they don't perceive a difference between those and FLAC files.
If you want to stream via iTunes or use your files with products which don't play well with FLAC, you'll probably be just fine with iTunes. Otherwise, if you intend to use a SB, Transporter or other FLAC-friendly device, you may want to consider using the method linked above.