As a communications technichian, you really have no idea how either system works.
If sirius is that much better explain their outdated compression format, the donuts that land repeaters create, and how more is not always better.
The 3 satellite system that people think is so superior because of the number is actually worse, if you look at the satellite paths, every 8 hours 2 satellites cross focused on the exact spot in the midwest. That makes for crappy coast coverage as everyone on either shore knows....And what about their new super satellite their launching you ask?? That satellite is to replace the satellite space they currently lease from comcast to feed their land repeaters. This feed comes from a geostationary orbit satellite (just like XM's), ever try to get 400 ground repeaters to latch on to the signal of 3 moving targets that constantly switch on and off???
While Sirius does have good programming their technology is FAR FROM SUPERIOR to XM. Make sure you know all the facts before you type...