XM is better for sports but doesn't come close with the talk radio or the music. On the XM comedy stations you are lucky to hear one or two comics an hour that you actually know. Sirius is non-stop big name comics. Maxim radio on Sirius is awesome plus there is Howard Stern. Faction has a great personality in Jason Ellis. The only thing XM has is the sports. Sirius does have sports but not really comparable to XM. I believe that Sirius recently purchased XM anyways so pretty soon you will see them merged.
It really depends on what you want. Sirius has enough sports that I can always find what I need but I am more into the music and comedy. The XM comedy is hardly even laughable compared to Sirius.
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