XM has 68 commericial free (more variety of music)
XM has better equipment (Smaller e.q SkyFI, Roady, Commander)
XM is cheaper per month
XM has 1.360 mil subs as end of 4th qrter
Sirius has 60 cemmericial free (play more hits, but also repeats)
Sirius has 240 k subs as end of 4th qrter
I have...