In the case of the X5, a standard moonroof is the same as a standard sunroof. It's a regular size sliding glass roof with a shade that covers the glass. The panoramic roof is roughly double, maybe a little more, the size of the standard moonroof and slides/tilts open as well, but it doesn't have a shade that permanantly blocks out all light (correct me if I'm wrong here guys!). The panoramic roof is a great option to have if you like the sunlight and openness it allows.

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2001 X5 4.4i
2002 Honda S2000