Sirius or XM?

For a music fan, which is better?

My tastes run towards jazz (traditional, fusion, a bit of contemporary), world (Cuban, Brazilian, Caribbean, African), electronica and some old-school/progressive hip-hop, gospel and soul.

I'd really like to offer some advice, but I have no idea what you're talking about.

Satellite radio services. Which is better?

Sirius. no commercials.