Since peoples tastes and needs differ the best way to chose is to actually listening to each, http://www.Sirius.com to listen to the same thing being transmitted to the sats, I recommend US-1 if you like the traditional radio format, DJ commentary etc. or The Trend. And to hear XM you can go to best buy or wherever and listen in the store (web just has a sample proabably due to re broadcasting licensing issues).

Someday our radios will have the capability of listening to both Sirius and XM! Then you'll be able to just jump between the two!Early adoptors always pay a price.