if you are comparing the GT vs any X series its the shape of the cargo area and back seat. The GT has a long and lower cargo area so its great for long skis and will fit two road bikes for example but its low in the far back. The X3 cargo area is shorter but higher for example so if you want to bring a dog, dog crate or child's play crib it would fit better in that. If you need to bring tall rubbish cans to a dump for example they will fit in a X3 or X5 but not in any GT.
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