Hey Donnie-
I've had both...
I used to have Sirius and switched over to XM about a year ago or so.
They are rather comparable, IMO...I preferred the sports/talk programming that XM offered, which is the only reason I switched.
Also, XM and Sirius have merged and will be doing business going forward as XM...
I'd encourage you to purchase the XM product to ensure you don't have any compatability issues down the road.
I have XM in my car, my office and my bedroom...Its pretty addicting and well worth the $20/mo. I pay for it...
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Bill in Dayton
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Bill in Dayton