The reason Audio CD-Rs and CD-RWs exist is sole reason of home CD-Writers ( the things by Philips that look like stereo equipment ). These have been around for a while and can only copy or create audio CDs. With this in mind it has been decided by the powers that be ( Sony / Philips ) that any discs written on these should have some money going back to industry. So basically the 'Audio' CD-Rs / CD-RWs have a specific byte of data written right at the beginning in one of the sub channels, the home systems will ONLY write to these discs. So as a result the media is also more expensive to pass the cost back to the industry.

One thing of note is that just because a CD-RW has Audio written on it, it doesn't mean that you will be able to play it back in your HI-FI. Most new CD players have 'multi-play' written somewhere on them, this means they are capable of reading CD-RW discs but unfortunately most of them aren't.

As far as PC CD-R/W drives are concerned there is no difference between the 2, the quality is the same, the media is the same, it will ignore the info specifically set for the home players.

So my advice is to get the best discs you can at the best price, there is no reason to get the specific audio ones.