In Napster, you pay $14 a month to rent
the tunes. As soon as you unsuscribe, you lose all your tunes.
iTunes on the other hand, you download the songs and keep them. They can only be transferred to 3 PCs, but I put some on a disk and they have gone to more than 10 and everyone can hear them, it's only when transferring directly it counts. I find that iTunes is much better