Trunk comparison: VW Tiguan Allspace vs VW Touran

Key Differences
In terms of cargo volume, the VW Tiguan Allspace leads over the VW Touran when the seats are upright: with all seats upright, the Tiguan Allspace is 5.1 in (38%) longer, and when only the front row is upright, the Tiguan has a trunk that is 4.3 in (11%) longer.
In contrast, the trunk opening of the VW Touran is 5.5 in (19%) higher than that of the Tiguan Allspace. Additionally, the loading edge of the Tiguan Allspace is 5.9 in (24%) higher above the ground than that of the Touran.
Impact on Usability
The longer interior dimensions of the Tiguan Allspace with upright seating make it more practical for longer items to be transported without folding down seats (e.g., slatted frames, sports equipment, long boxes). The greater length improves everyday usability when regularly carrying bulky but not very tall cargo.
The higher trunk opening and lower loading edge of the Touran, on the other hand, mean significantly easier loading and unloading of heavy or bulky items: heavy luggage can be lifted more easily over the lower loading edge in the Touran, and tall items fit better through the higher opening.
In practice, the Touran is therefore more comfortable for frequent lifting of heavy loads or for tall cargo (e.g., larger boxes, crates, strollers in upright position).
Smaller differences (e.g., Tiguan Allspace +4.3 in/6% with folded rear seat, Touran +2 in/5% at the narrowest point, and Tiguan +3.9 in/10% in opening width) exist but only slightly affect everyday use.
In summary: Tiguan Allspace offers more interior length with upright seating, while Touran offers more ergonomic loading conditions due to higher opening and lower loading edge.