My parents have both. They had XM in their house, then they bought a car that had Sirius. They seem to like the music choices on Sirius better, so they cancelled their XM. I have XM in my car and am very happy with it. Your best bet is to check the channel line-ups on line to see what's to your liking.It looks like they may be merging anyway, in which case they'll probably be offering different radio packages, and eliminating some channels on each.