What is the best Satellite Radio Provider?

I have had both, and my preference is XM. I find their pricing, channel lineup, overall signal quality, available hardware, general format and playlist rotation to better suit my preferences. XM Online is my choice for mucic-while-at-the-computer, too; in fact I have it running right now.

Depends on what you want it for. XM carries MLB and Sirius carries NFL. My hubby has Sirius and loves it. But that's because he is into football, not baseball.

howard stern is moving to sirius in january.
sirius is the system i'll be getting...

My opinion is that XM plays better music and has better original programming. Sirius has better DJ's and more prominent names on the talk channels. Sirius has better talk channels. I am eagerly awaiting the arrival of Howard Stern on Sirius. It should be pretty interesting without FCC restrictions. Sirius also has better comedy channels. I have both Sirius and XM and am happy with both for now. Are there other providers out there that I should be checking into?