I want satellite radio for a several reasons: 1. When on a long drive, there are often areas that have nothing but crappy radio stations. You can listen to the same station coast-to-coast on satellite. 2. The quality of the sound over the FM airwaves is several notches below a CD (prove it to yourself next time you hear a song on the radio that you happen to have on CD, then pop the CD in and hear the difference). Satellite radio is digital, near CD quality. 3. There are commercial-free music streams for just about every genre. No more scanning the dial to find something you like. Sirius has at least 5 or 6 streams I can see listening to all the time. 4. ESPN radio is on all the time. 5. More variety than the CDs I would happen to have in the car at any one time.
All other things being equal, I would choose XM, but Sirius is very good also, and it's worth it to me to have it stock and controlled through the stock head unit & steering wheel buttons. Sirius is also 100% commercial free, while XM has some commercials. I think Sirius will survive because there are too many car companies that provide it as an option to let it fold.