WAV and AIFF are just raw data files and should perform the same. WAV can hold tags but there is no agreed standard. AIFF has got a standard for storing tags.
Audiofun is right. The argument that FLAC and ALAC are bit perfect is like saying I am a great pianist because I can play all the notes on the keyboard - it isn't enough. The bits need to be delivered with very low levels of distortion of the waveform that represents those bits to avoid jitter problems, and one of the ways to improve that with computer audio is to reduce the number of tasks being performed concurrently by the PC - like unpacking files. The difference in sound between AIFF and ALAC does however differ depending on the Mac used and how it is set up.
Audiofun is right. The argument that FLAC and ALAC are bit perfect is like saying I am a great pianist because I can play all the notes on the keyboard - it isn't enough. The bits need to be delivered with very low levels of distortion of the waveform that represents those bits to avoid jitter problems, and one of the ways to improve that with computer audio is to reduce the number of tasks being performed concurrently by the PC - like unpacking files. The difference in sound between AIFF and ALAC does however differ depending on the Mac used and how it is set up.