Thanks for the clarification.. Beyond Howard and some sports, what does Sirius have that XM doesnt?
Much better Canadian content, for one. Excepting NHL, ATN, and the Verge, most of XM's CanCon is just looped programming that is obviously only there to meet Canadian requirements.
Sirius has much better Canadian partners; granted, quite a bit of Sirius' CanCon is remixed terrestrial radio, but at least it seems listenable.
Also, Sirius has NPR and WRN; I think at least "NPR Now" would be a great complement to XMPR.
Furthermore, there are specialty channels with Elvis, Margaritaville, Shade 45, Faction, Siriusly Sinatra, and Metropolitan Opera. Talk specialties include Martha Stewart, Playboy, OutQ, Catholic Channel, EWTN, and Cosmo.
Obviously there isn't room to add all of it to XM, but it's also possible that some of the aforementioned Sirius stations could be added by merging with and/or replacing equivalent XM programming. Particularly in the Canadian selection, XM wouldn't have much to lose by dumping Canada 360 for CBC 1, for example. Although, it's unclear whether the Canadian government would allow it.
I could see Siriusly Sinatra integrating select programming from XM High Standards, especially since Sinatra would be the larger brand name.