Trunk comparison: Audi A3 Sportback vs Skoda Superb Wagon

Key Differences
The Škoda Superb Wagon offers significantly more cargo space: with the seats folded down, the trunk is +25.2 in (43%) longer and with the first row upright, +11.4 in (38%) longer than the Audi A3 Sportback.
The width of the trunk opening is 3.5 in (9%) larger on the Superb, the narrowest trunk width is only slightly increased (+0.8 in / 2%), and the height of the opening is 2 in (6%) higher.
In contrast, the Audi stands out with a trunk depth (distance from loading edge to trunk floor) that is +3.1 in (100%) greater and a loading edge that is +3.1 in (14%) higher above the road.
Impact on Usability
For transporting long or bulky items, the Superb is clearly advantageous: the significantly greater loading length with folded seats and upright seat row allows loading slats, pipes, skis, furniture parts, or multiple large suitcases without complicated positioning.
The slightly wider opening width also makes it easier to load wider items.
The Audi A3 has two practical disadvantages that make handling heavy or awkward loads more difficult: the higher loading edge makes lifting and loading heavy loads more strenuous, and the significantly increased depth between the loading edge and trunk floor creates a more pronounced step/lip – this can make sliding long items through more difficult and causes smaller parts to get caught more easily at the entry.
On the other hand, a deeper loading floor can help some loads sit lower and thus more stably, but at the cost of loading and unloading convenience.
In summary: Those who regularly transport long, wide, or many pieces of luggage will benefit significantly from the Škoda Superb Wagon.
Those who mainly have more compact, lower loads and pay attention to city-friendly vehicle dimensions will find the Audi A3 a suitable package – however, when frequently loading heavy items, the higher loading edge and the step to the trunk floor are disadvantages.