
Originally Posted by
ValleyFan
I purchased a lifetime subscription to Sirius back when they carried the NHL, which in retrospect wasn't a wise move by me. The major difference between the two is sports, and to a lesser extent the talk that they offer. Sirius has NFL, NBA, NASCAR, some soccer and collage. XM has the NHL, MLB, PGA, and collage. One thing I have heard (although can't confirm because I haven't listened to XM) is that XM tends to have a slightly deeper playlist, so if you are listening to a channel all day, you are less likely to hear the same song twice, while on Sirius, if you are listening all day, you might hear a song more than once.
The other difference between the two (and again, I don't know how it affects the XM side, so perhaps someone could jump in) is that XM uses satellites in geosynchronous orbit, while Sirius has 3 satellites in a closer, elliptical orbit so at any time a maximum of two will be over the US. While this is supposed to allow the satellites to be more directly overhead for most of the US, you will notice that the signal is better at some times than others. I believe in 2008 they are planning to launch a geosynchronous satellite to help coverage.
All that said, I really like Sirius, the music offerings are really good, and I like the talk that they offer and having NFL isn't bad.