I have the limited Sirius through DishNetwork and full XM service on other radios.
Since I am a huge fan of both the Red Sox and the Patriots. There are only 16 Patriots games on Sirius and 162 Red Sox games on XM. I also enjoy Folk music which has a dedicated channel on XM (Channel 15 The Village) and there is no channel close to this genre on Sirius.
Based on these two personal preferences, we have 3 XM radio setups.
1. XM Radio built directly into my Honda Element
2. Delphi MyFi (my original), I use this in rental cars, hotel rooms, and offices
3. Roady XT in my wife's PT Cruiser.
I am sure that no matter which service you choose, you will enjoy Sat Rad.
Bob