Trunk comparison: VW Taigo vs VW Tiguan Allspace

Key Differences
In terms of pure cargo space, the VW Tiguan Allspace has the advantage when it comes to length for long loads: when all seats are folded down, the Tiguan Allspace offers a cargo area that is 13.4 in (22%) longer, and when the first row of seats is upright, the Tiguan Allspace still has a cargo area that is 11.8 in (37%) longer.
In everyday use with all seats upright, however, the VW Taigo comes out ahead: the Taigo has a trunk depth that is 13.8 in (74%) longer in this configuration.
Other relevant differences include the opening height and width: the height of the Taigo's trunk opening is 3.1 in (11%) greater, while the width of the trunk opening on the Tiguan Allspace is 5.9 in (15%) greater.
Particularly noticeable is the trunk depth (distance from loading edge to floor): the Taigo is 7.9 in (1900%) higher here than the Tiguan Allspace.
Implications for Usability
The longer cargo area of the Tiguan Allspace with folded seats and with the first row upright makes it significantly better suited for long items (e.g., slats, long furniture parts, skis) or for transports where the rear seat bench must be partially or fully folded down.
The 5.9 in wider trunk opening of the Tiguan also makes loading and unloading wider items easier.
The Taigo scores in everyday use: With significantly more length in the trunk with seats upright, it offers more usable storage space for luggage, shopping, or strollers without folding the seats.
The 3.1 in higher opening and the substantially deeper trunk recess (7.9 in difference) mean that the Taigo has more volume available below the loading edge and bulky or tall items can stand or be stacked better inside the vehicle.
The slightly lower loading edge (Tiguan +0.8 in) is only a minor advantage of the Tiguan when lifting; practically noticeable are mainly the greater lengths in the Tiguan and the better interior space utilization in the Taigo.
In short: For regular transport of long or wide loads, the Tiguan Allspace is the better choice; for everyday usability with more usable trunk volume with seats upright and easier stacking or storing of luggage, the Taigo is more advantageous.