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I can't say which is better, but I have a pioneer unit and am very happy with it. To answer your question, the Pioneer does open up to accept both a music CD and the Nav. DVD.
Which one is better and why? Does the pioneer open up like the eclipse does?
haven't heard the z1 yet but on the assumption that it's based off similar hardware as the n1/d1 the eclipse will be a better choice for sound quality. but they are both decent units