Trunk comparison: Mercedes Benz GLC vs Seat Tarraco

Key Differences (highlighted: >10%)
The SEAT Tarraco offers about 20% more cargo length with the first row of seats upright than the Mercedes-Benz GLC. Additionally, the Tarraco has a significantly greater depth between the loading edge and trunk floor (+2.4 in / 500% according to specifications).
What this means for usability
The approximately 20% longer cargo length with the rear seat upright makes the Tarraco more practical when transporting long items without folding down seats (for example skis, slats, long boxes). Families who want to transport both passengers and longer luggage at the same time especially benefit from this.
The greater depth from loading edge to trunk floor means the Tarraco has a deeper loading horizon — this allows bulkier or taller items to be better accommodated, and cargo can lie deeper and thus more stably.
However, the Tarraco's loading edge is about 1.6 in higher above the road, which makes handling heavy or bulky boxes somewhat more strenuous (more lifting height).
The GLC, on the other hand, scores with a slightly wider narrowest trunk width (about 9% larger) and a lower loading edge, which facilitates loading wider items and lifting heavy loads.
Differences such as the 7% longer overall length with folded seats or the 9% higher trunk opening height on the Tarraco exist but are less significant for everyday usability.
Practical recommendation
Choose the SEAT Tarraco if you more often transport long or deep cargo while using the rear seat. The Mercedes-Benz GLC is the better choice if you frequently load wider items or prefer a lower loading edge for easier lifting.