Trunk comparison: Audi Q7 vs VW Tiguan

The Audi Q7 offers noticeably more cargo length: with the seats folded down, the trunk is 12.2 in (18%) longer, and with the first row upright, the advantage is even 12.2 in (35%) compared to the VW Tiguan. Additionally, the width of the trunk opening on the Q7 is 4.7 in (11%) larger.
Impact on Usability
The greater cargo length makes the Q7 significantly more practical for everyday use with long items (e.g., slats, skis, furniture parts) and for larger luggage loads during trips.
Especially with the first row upright, the Q7 is better suited when passengers remain in the rear seats but long cargo needs to be transported. The wider trunk opening facilitates loading and unloading bulky or wide items and reduces the need to maneuver items at an angle.
The other differences are minor: opening height (+0.4 in), depth between loading edge and floor (+0.4 in in favor of the Tiguan, negligible), and loading edge height (+1.6 in on the Q7) hardly affect the volume; the slightly higher loading edge of the Q7 makes lifting heavier loads minimally more strenuous.
Overall, the Q7 is the more practical choice if regular transport of long or bulky items is important; the Tiguan remains sufficient for everyday use and more compact cargo.