Trunk comparison: Citroen C3 vs Seat Tarraco

Key Differences
The SEAT Tarraco offers significantly more cargo length: When all seats are folded down, the trunk of the Tarraco is +20.1 in (38%) longer than that of the Citroën C3; with the first row of seats upright, the advantage is even +17.7 in (67%). The width of the trunk opening is +10.6 in (31%) larger in the Tarraco.
In contrast, the Citroën C3 has a significantly deeper trunk well between the loading edge and the floor: +6.7 in (283%) compared to the Tarraco.
Smaller differences — trunk opening height (+1.6 in / 5%), loading edge height above the road (+1.2 in / 4%), and narrowest width (+2 in / 5%) — remain under 10% and are less relevant.
Impact on Usability
The greater lengths and significantly larger opening width of the Tarraco make it clearly superior in practice for long or wide cargo: furniture, long slats, strollers, or multiple suitcases can be stored more easily and space-efficiently, both with the seat row upright and with seats folded down.
The larger opening width also facilitates loading wider items.
The deeper trunk well of the Citroën C3, on the other hand, offers more vertical storage space below the loading edge, which is good for discreetly storing luggage or for bulky but not very long items.
However, the greater depth can make handling bulky or heavy items somewhat more cumbersome because they need to be lifted higher when removing or lowered deeper when storing.
Since the differences in loading edge height, opening width, and interior width at the narrowest point are relatively small, they hardly affect everyday use.
In summary: For cargo volume and flexible loading of large/wide items, the SEAT Tarraco is the better choice; for hidden, deep storage with more compact loads, the Citroën C3 is advantageous.