I post this in all the satellite radio threads:
Let me start out that, no matter which service you choose, you will be happy.
When I purchased Sirius in Nov 2003, I went with Sirius for the following reasons:
1) 100% commerical free right from the beginning. They seemed to be more about the music and dedicated to it. (XM just went commercial free this month)
2) They support trance music more tham XM and had a Trance channel, which sadly they axed, but they moved it to daily trance shows and one long weekend show on another Dance channel
3) Better and cheaper equipment and setup costs. I have an AudioVox PNP2 with a car kit and home kit.
4) The Sirius display is MUCH better than the Delphi one, and doesnt get washed out in direct sunlight like the Delphi Unit. It also allows you to remember 20 songs that it will let you knwo are playing on any stream. I have 20 of my favorites there and when its playing I get a beep and have the option of listening to it and switching channels. It also displays more characters than the 16 that XM is limited to, so I get a lot more song and artist information without it being cut off.
5) Several of Sirius's stream jockeys have a very active presence in the "Community" and listen to their listened. Case in point DJ Victor Dinaire who programs some Kickass Trance music and posts on the Sirius Backstage forums. I would definitely recommend you go there and read as much as you can and you will learn a lot. Do not freak out about any problems people are having. As with any technology there are some glitches here and there, but overall it's a great experience.
6) They Have NPR, XM doesnt
7) If you are into sports, this year is going to be great for Sirius. They have NFL, NHL, NBA and ESPN. If you tune into a stream, the display will show you the score! of the current game XM only has NASCAR and ESPN. You will be able to listen to your home games should you ever have to move.
8) In the Future, Sirius is promoting data and video as well with Tiered pricing, and should be available in a year or so. They plan on 3-4 streams of video, mostly cartoons and MTV stuff to keep kids busy on long trips. They are also going to be promoting their data streams to allow you to select stocks and get the quotes live etc. Pretty nice, and definitely something I could have used on my long trip.
9) Web streaming of the radio channels so you can listen at work if you want (I do).
I did my research and chose Sirius. I would strongly recommend you go to
www.sirius.com and click on listen and select a stream. You will get to listen for 20 minutes and it will reset the 20 minutes if you change streams, so you can listen to it nonstop and really review the product and this is LIVE, so what you hear is what all subscribers are hearing. It is not a soundbyte. Also, the quality of the online streams arent the best, so dont assume that it actually sounds like that. I reviewed the streams for a while before going with it. Also the talk and news streams are not online due to legal reasons (they can only put online stuff that is done "in-house". )
Let me know if you want more details. Again, I strongly recommend you go to Siriusbackstage and read up. Also check out the photographs of CES.