Trunk comparison: Seat Ibiza vs VW Tiguan Allspace

Key Differences (highlighted: >10%)
The VW Tiguan Allspace offers +19.3 in (35%) more trunk length with the seats folded down and +17.3 in (65%) more length with the first row upright than the Seat Ibiza. The trunk opening of the Tiguan is also significantly wider: +10.2 in (30%) compared to the Ibiza.
Conversely, the Seat Ibiza has a longer loading floor of +8.3 in (45%) with all seats upright, a higher trunk opening by +3.9 in (14%), and a significantly greater depth between the loading edge and trunk floor by +7.5 in (1800%).
Additionally, the loading edge of the Tiguan is +3.1 in (12%) higher above the road than that of the Ibiza.
Impact on Usability
For transporting long or wide items, the Tiguan Allspace clearly has the advantage: the greater interior length with folded seats and the wider opening make it easier to stow long beams, furniture parts, or bulky boxes. However, the higher loading edge of the Tiguan makes lifting heavy loads somewhat more strenuous.
The Seat Ibiza is more practical for everyday use when the seats remain upright or when taller items need to be transported more frequently.
The greater trunk height and larger depth create more vertical space and a deeper loading floor; combined with the lower loading edge, this makes loading and unloading shopping bags, crates, or bulky but not very long items easier and more back-friendly.
In short: Tiguan Allspace = better for long and wide cargo with folded seats; Seat Ibiza = better vertical storage space, lower loading edge, and more comfortable everyday loading with seats upright.