Trunk comparison: Audi A3 Sportback vs Seat Tarraco

Key Differences
The SEAT Tarraco offers significantly more cargo length: with seats folded down it is 15 in (26%) longer and with standard seating 13.8 in (45%) longer than the Audi A3 Sportback. The trunk opening of the Tarraco is noticeably wider: by 7.1 in (19%).
The opposite applies to the loading height/trunk floor ratio: the Audi A3 has a much greater depth between the loading edge and trunk floor, 3.9 in (167%) higher than the Tarraco. Additionally, the loading edge of the Tarraco sits 3.1 in (12%) higher above the ground than the A3.
Impact on Usability
More length and a wider opening in the Tarraco make it easier to load long or bulky items (e.g., furniture parts, sports equipment, long boxes). Those who frequently transport wide or long cargo clearly benefit from the Tarraco.
However, the higher loading edge of the Tarraco means more lifting effort when loading: heavy items must be lifted higher, raised over the loading edge, and then pushed into the vehicle. This can make loading heavy boxes or equipment more strenuous.
The Audi A3, on the other hand, has a significantly deeper trunk well (greater depth from loading edge to floor). This creates more usable volume below the loading edge and allows cargo to sit deeper.
The lower loading edge of the A3 also makes it easier to lift heavy items over the edge. In everyday use, this means heavy or bulky parts are often easier to lift in the A3, while the Tarraco makes maneuvering easier due to its width and length.
In summary: For longer and wider cargo as well as family and leisure use with lots of luggage, the Tarraco is advantageous. For frequent handling of heavy items or when a lower loading edge is desired, the A3 offers ergonomic benefits despite its smaller length and opening width.