Can anyone tell me the difference between XM and Sirus radio?!

Can anyone tell me the difference between XM and Sirus radio?

Please tell me what you know about this. How much does it cost? How much do you have to pay monthly? Why one or the other?

"... there's very little difference between the two services, and whichever you choose, you'll almost surely be happy with"

Both offer over 60 channels of advertising-free music, and a similar number of additional channels with various types of entertainment, news, talk and commentary shows, and traffic and weather reporting.

Both stations even offer some identical channels (eg BBC World Service).

Both give excellent coverage with very few signal 'dead areas' throughout the USA.

Both give good quality stereo music, although XM Radio is perhaps slightly superior to Sirius; although the difference is hard to detect with regular music playing through a car stereo.

Both have similarly priced receivers with similar features.

Both have similarly priced monthly subscriptions.

Both have websites that can stream most of their content to your computer, in addition to your receiving it through your satellite receiver.