V,
What do you like to listen to? I have both XM and Sirius. If you like talk radio, Sirius is the best (John Batchelor, awesome show, ABC Radio). Nascar, XM. Music, I like the selection on Sirius over the XM. NFL, Sirius. In fact, the only reason I have the XM, is that Coast to Coast AM (Art Bell/George Noory) is only available on XM. I can't get him where I live on the am radio. I work nights driving a truck, I will listen to him on the way home, and get caught up in the show, so I have XM in the house. Been listening to him for years, don't agree with everything, but it is a nice diversion from all of the crap going on in the world. Besides, he has gotten me through many a snow storm and very long trips over the road. I like the night.
Sirius is my suggestion. Best music and talk. Sports? Take a look at their individual offerings.
Mike