Just saw this thread by chance and do have some commets - even if it might be too late.
I do not see any better performance of AIF against WAV files. Both are supported as (uncompressed) files file formats since the very beginning of QuickTime.
Over the years there had been some changes. Apple created it's own version of AIF which is still uncompressed but may appear at some apps as compressed.
WAV files do allow to have metadata - with their "BWAV way" which is recorded by standard audio HDRs.
Most applications including Final Cut Pro will allow to read this metadata which will include: timestamp, scene, take, note and reel. So this "extended" WAV format is way superior compared to the "flat" AIF format.
But note the difference between timestamp and timecode!!!
Anyway- again my personal opinion is: never change an existing WAV to AIF, better you do it the other way round, if got the tools.
Andreas
Spherico
http://www.spherico.com/filmtools