Trunk comparison: Audi Q7 vs VW Tiguan Allspace

Key Differences
The most noticeable difference concerns the trunk volume with all seats upright: the Audi Q7 has a trunk that is 28.3 in longer – that's +153% compared to the VW Tiguan Allspace. This advantage is clearly above the 10% threshold and thus the decisive practical difference between the models.
Other Measurements (under 10%)
Other measured differences are significantly smaller and fall below the 10% mark: with folded seats, the Q7 is +5.1 in (7%) longer, with the first row upright +2.8 in (6%), the height of the trunk opening +1.2 in (4%).
The trunk depth is the same, the loading edge height is +0.4 in (1%) in favor of the Q7. The narrowest width in the trunk is +3.1 in (8%) for the Q7, the width of the opening +2.8 in (6%).
Impact on Usability
Because the Q7 offers significantly more cargo space with all seats upright, it is much better suited when transporting luggage or larger items in addition to a full passenger load (e.g., a larger family with suitcases, shopping trips, bulky cargo without folding the seats).
The smaller advantages in width and opening help when loading wider items but are rather marginal in everyday use. The same depth means that basic cargo floor lengths are comparable, so the Q7 plays out its major advantage mainly through the additional usable length with all seats upright.
Conclusion
For users who regularly need to transport a lot of luggage or bulky cargo with a fully occupied vehicle, the Audi Q7 is the more practical choice due to the significantly larger trunk with upright seating.
If the vehicle is mostly used with fewer passengers or with folded seats, the differences are less significant in everyday life.