I went with sirius, just because that is what my wifes Clarion in dash dvd player is compatible with. Like rberry88 said, it is all preference, if you like MLB, go with XM, if you like NFL, go with sirius, if you like Howard Stern, go with Sirius, if you like Eminem, go with Sirius, otherwise, look at the features of both, and decide for yourself.