I really don't think that the choice has much to do with sound quality, although convenience certainly may have at least something to do with it.
As far as quality goes, there are quite a few sites that sell high quality downloads that at least equal CD quality. I've had good results with the stuff that I've downloaded from places like HDTracks.
As far as quality goes, there are quite a few sites that sell high quality downloads that at least equal CD quality. I've had good results with the stuff that I've downloaded from places like HDTracks.