AAC is a perfectly fine audio format. It sounds good. I don’t really want the music I pay money for to be encoded at 128k, but none of iTunes’ competitors are offering a higher bitrate, so I don’t have much choice there. The problem with AAC is that it doesn’t really have digital rights management, so songs you buy through the iTunes Music Store have an Apple-specific proprietary digital rights management scheme called FairPlay attached to them. AAC may be a format that many desktop applications (like Winamp) can understand, and it’s certainly possible for non-iPod portable players to build in support for it, but iTunes and iPods understand FairPlay. If I buy music through the iTunes store, it will only play on iTunes or an iPod. That’s it, until the end of time.”
iTunes Bad, WMA Good
“After immersing myself in audio codecs (as research for a future article) and re-ripping most of my own collection, I’ve come to the conclusion that I really like WMA—and I really don’t like the whole iTunes/iPod thing.