Hey, I've been looking into this myself. Don't know if the facts are still true, but you could buy a lifetime subscription to Sirius, which you couldn't do with XM, and it paid itself back after something like 3 years.
Also, I think XM is about as commercial-free as Sirius, or so their marketing would have you believe.
Since I know no one who's had both, can you debunk this info jdagsxr? I'd like to know too
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