Trunk comparison: Ford Focus Wagon vs Peugeot 208

Key Differences
The Ford Focus Wagon offers significantly more cargo length: +20.9 in (40%) with the seats folded down and +14.6 in (55%) with the first row upright compared to the Peugeot 208. The narrowest trunk width of the Focus is +6.7 in (18%) larger, and the width of the trunk opening is even +8.7 in (26%) larger than in the 208. The Peugeot has a notably greater trunk depth (distance from loading edge to trunk floor): +6.3 in (800%) — additionally, the loading edge of the 208 sits +3.1 in (13%) higher above the ground.
The height of the trunk opening in the 208 is only +1.6 in (6%) larger and thus not a relevant difference.
Impact on Usability
For long or bulky cargo (lumber, skis, long boxes), the Focus is clearly advantageous: the greater interior length with folded and upright seats as well as the wider opening make loading, sliding, and stowing long items much easier.
The larger narrow width reduces bottlenecks when storing wide boxes or sliding in bulky parts.
The Peugeot scores with a significantly greater vertical "depth" in the cargo area: this creates more usable vertical space below the loading edge and can be an advantage if you want to sink tall, slim items deep into the trunk or arrange luggage in layers.
However, the loading edge of the 208 is higher, which makes lifting heavy items during loading more strenuous and unloading more difficult. The slightly higher opening height (+1.6 in) is practically negligible.
Conclusion: Those who frequently transport long or wide cargo benefit from the Focus Wagon. Those who need more "deep" storage space for stackable or tall items and can live with a higher loading edge will find the Peugeot 208 a more compact but differently usable solution.