I've got a friend that has XM, she got me started on XM. She likes Sirius more. I kid her all the time, with if you had Sirius you could listen to this station. LOL
I'm not huge into dance, but everyone that's listened to the Sirius dance and the XM dance, they like Sirius better. For one reason, XM has not blended dance of hip hop and electronic while Sirius does. Sirius just has more choices.
Now from what I've seen XM has better specials. I've recorded several XM shows but have not recorded any Sirius shows. I think XM wins out there but for day to day listening, Sirius blows it away. Maybe I'm to dumb to be impressed by the names, I know which music sounds better.
Thing is those Djs are only there for specials. I've not listened to Lud's and Snoops shows yet but I've been meaning too.
I've wondered if the younger crowd might go for XM more than the older crowd and I'm old as dirt for this business.
Now XM has a Bob Dylan show coming up, that should be awesome. I'm pretty sure one of them has landed Tom Petty with a regular show. Maybe not. Alice Cooper mentioned on his show that Tom Petty has his own satellite show but I can't find it in the listings. So Alice either got bad information or let the Destroyer out of the bag before he was suppose too.
I'm more of a rocker. I like it hard and I like it harder.

I don't like either of the providers hardest channels though. I like there to be at least some melody to the music. LOL
XM did have some nice New Years shows. But again, day to day, Sirius kicks XM's ass all over the airwaves.