Not to mention that Sirius web streams are free - (((XM))) you
gotta
pay an extra $4 a month.

But the service costs less to begin with, the streams are much better
sound (higher bitrate) and they have XM music instead of Sirius.

Also, you can't get the Sirius streams unless you also have a Sirius
radio. You can get XM online without a radio subscription.