I used to sell both when I worked at Best Buy. I actually heard better compliments from Sirius than I did XM. And me being in that department all day long for 7 months, I found myself listening to a Sirius receiver rather than an XM. Really most of it is personal choice, and the main difference is sports and talk shows. And if you're going to hook it up to your car, you are definetly better off hard wiring it to your radio. The FM Transmitter is total crap.
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