I only use itunes... I have over 4000 songs on itunes... my ex had zune, and I was not please with it... but he only had that cause he didn't want to follow what every one else was doing... Zune is okay... but I told him (at the time it was 2008) that if he wanted to use a crappy product and bend to the will of microsoft he is all in his right. But don't expect me to bend to Bill Gates will.
The only reason I don't own an apple computer is due to A. being to expensive and B. It's not a good gaming computer.