XM or Sirius?

Does anyone have satelite radio? I am totally fed up with the same 10 songs they play on the radio here and I'm gonna test drive the new Civic SI Coupe this weekend and I think it comes with XMradio. Is this better than Sirius or the other one not sure of the name...BTW I work for Honda and can't believe they are finally showin the Civic some love again by making it supersporty and YAY to the awesome sound system! Just not sure about the satelite thingy though... Anyone got XM?