Trunk comparison: Audi Q3 vs Skoda Elroq

Key Differences
The Audi Q3 offers with the front seats upright a cargo floor length that is 3.9 in (13%) longer than the Škoda Elroq. Additionally, the trunk depth (distance from loading edge to trunk floor) is 3.1 in (800%) greater in the Audi.
Smaller differences: the Audi has a trunk opening that is 0.8 in (3%) higher and a loading edge that is 2.4 in (9%) higher; the width of the trunk opening is 3.5 in (9%) wider on the Audi.
The Škoda Elroq only has a 0.4 in (1%) longer cargo length with the seats fully folded down. The narrowest width inside the trunk is the same for both models.
Impact on Usability
The 13% longer cargo floor with the front seats upright makes the Audi Q3 more practical for everyday use when passengers need to remain seated: longer items (e.g., slats, skis, long boxes) can more often be transported without folding down the seats.
The significantly greater depth of the Audi (3.1 in more) increases usable trunk volume and allows better stacking of lower-lying cargo; items sit further inside and provide more storage space but may be somewhat harder to reach if placed far forward.
The slightly higher loading edge of the Audi (2.4 in) can make lifting heavy loads in somewhat more difficult compared to the Škoda; at a 9% difference this is noticeable but not significant.
The slightly higher trunk opening (+0.8 in) makes loading tall items a bit easier, and the somewhat wider opening (+3.5 in) on the Audi makes maneuvering large or bulky parts easier, though this is just under the 10% mark and less pronounced than the length and depth differences.
The 0.4 in longer cargo floor of the Škoda with folded seats is practically negligible.
Conclusion: For users who regularly need to transport long or deep cargo (even with passengers), the Audi Q3 has the advantage due to its significantly larger usable cargo floor. The Škoda Elroq offers hardly any real advantages in pure cargo floor length.