I would recommend XM because I have had it for about 2 years now. There is no difference in price because sirrus has lowered there prices to $10 a month just like xm is. I have my unit sitting on the dash and connected to the factory stereo through a wireless fm modulator. I love xm and would highly recommend it to anyone out there especially if you go on long trips or travel long distinces to work everyday like I do. The comedy channel alone is worth the $10 a month. I have the old unit by sony that came out about 2 years ago and I can easily take it out of the VX and hook it up at home or at work. The great thing about the wireless fm modulator is that I can hook it up in the car and run it through the stereo in my garage at the same time.
O yeah just a tidbit for any of you tech guys out there. I was talking to one of the local stereo shops around my hometown. He said that XM might be buying out Sirrus to use there satilite to broadcast live Music videos and movies for your car. But that might have been just a bunch of bull. Take it for what you will but that would be great for everyone.

VXGAS