Hey Bill, I have compared the two, I have had Sirius since the start up of Sirius. Channel 88 NFL is only the NFL channel, NOT the NFL Network in which I get ALL the games playing. On game days they are on other channels. I have spoke with Sirius XM extensively on the differences between the XM and Sirius line up. The other think you may not know is that they are different satelite systems with different signals and Sirius is a stronger more clear signal. I have educated myself BEFORE wanting to ditch the XM, I also have friends that have had XM and switched to Sirius and they noticed a BIG difference. Its kinda like a kenwood and pioneer car stereo, pioneer has a better tuner and stations come in better, kenwood has better CD players. Not arguing, just letting you know the difference.
Wesley