Realistically it's all about:
a) What system your existing car audio might be ready for
b) Which systems programming you like better
First of all, the technology is virtually the same. Saying that XM is always up on the technology makes no sense, as the MyFi could be developed for Sirius with about a days engineering. There may be licensing or copyrights involved, but that could go either way. As for pricing, pricing is likely to change every so often, with both sides one-upping each other now and again. It's just like Sat TV or Cable. Even the programming changes. Contracts get signed, get broken, shows cancel, DJs die... whatever... but programming would probably be the number one thing to look for between the two. It's not like cable vs. satellite, where landlines provide higher bandwidth and (generally) better quality. XM and Sirius are both sat-based, both have some artifacting, both sound better than radio, worse than CD... *shrug* There's honestly not much to have an opinion about. Even hardware... that's like going with Cox or Comcast over DishTV because they have a silver HD box, and DishTV has a black one... (Again, my opinion stands that cable is GENERALLY a better option... just so there's no confusion).
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