I cannot tell you too much about the hardware.....but......the reception for XM was much better in my car than Sirius. I still went with Sirius due to the programming. I would look at programming long before hardware. They both offer a free online trial. XM claims to have a deeper playlist.....in other words, plays lots of B sides and crappy songs......while Sirius plays the more popular tunes that I want to hear. Your mileage may vary.
XM vs Sirius Portable Receivers - What's Out There
I'm looking at getting satellite radio to use at home, in the car and to use with headphones when I'm on the go. I see there is a Delphi MyFi unit for XM and a Sirius S-50. Are there other portables out there? Any thoughts on these two? How easy is it to use these units for different functions, such as in the car, at home or at the gym, for example? What about sound quality?