I've never had Sirius but a friend of mine has had both (in each his and his girlfriend's cars). He said he prefers XM because of their lineup. He says the channels are much better on XM.

I really don't care about listening to Stern either. I didn't mind listening to him on FM, but I wouldn't switch to Sirius just to hear him.

Also, if I remember correctly, my friend said Sirius has pretty good receivers. The one he has is like TiVo. He can scroll back through something like 30 minutes of programming. But that was the only benefit of going with Sirius.

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