Hmm, satellite radio. My other field of expertise.
You might want to browse the numerous threads on the three major satellite radio boards. XM411 ,XMFan , and Siriusbackstage
I’ve worked for Sirius in the past, part time customer service supervisor.
I prefer XM. Still, the best way to test out the music is to get the free online trial for 3 days and see which you like better.
However, it is Christmas. XM has had 5 channels change format this month for Chirstmas music. Sirius has 2 Christmas channels, but has set aside stations for all Rolling Stones, all Elvis, and all Bruce Springsteen.
Sirius seems to want to nail that male demographic. They’ve got Stern, Maxim, Playboy, the NFL, NASCAR (2007) and are heavy on the Rock and Roll
XM is a bit more eclectic. Many of their channels are niche channels. You won’t hear XM playing the Beatles on a jazz channel.
It really depends on what you want. Sirius will have more DJs. They also tend to follow that DJ chat about whatever’s on their mind type format. XM’s DJs are more name, rank and serial number. The Sirius DJ will say…"My dog Joe Cool really digs that Miles Davis tune. He was humping my leg the past 5 minutes. The XM DJ will say, “That was the Miles Davis quintet from 1955 featuring…”
Anyway, sign up for the online trials, visit the various Sat. radio bulletin boards, and feel free to send me an email.
I’ve spent thousands of hours listening to both services.