Ok, IMHO:
I have had both. Sat Radio is definitely a must! I had XM for three years and just recently switched to Sirius in my H3.
XM - Overall better sound quality on all stations. Programming is weak at best. It got too boring to listen to.
Sirius - MUCH better programming. Better text, song info. Some stations sound as good as XM, others sound worse than XM.
I enjoy Sirius a lot more. With XM I kept hearing the tapes roll over...the same programs over and over. I just couldn't take it anymore. With Sirius, the programming is much better. They play a wider variety of music, better music, and more stations geared toward my ear.
So, if you ask me, I'd say go Sirius. Either way Sat Radio is great! Hope this helps.
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