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I feel like I have more room in my C3s than my 86 C4. From the drivers position that is. The C4 cockpit seems a little more cramped, and the door sills make it difficult to get into the car.
But from an overall interior space, the C4 has that won. I can fit two average sized suitcases for trips, where as the C3 I can barely squeeze one into the cargo area.
So for solo trips, I take the C3. For me and my wife trips, we take the C4.