Trunk comparison: Nissan Rogue Sport vs VW ID.4

Key Differences
In terms of length dimensions, the VW ID.4 is only slightly ahead: with the seats folded down, the trunk of the ID.4 is 1.6 in (2%) longer, and with the first row of seats upright, it is 2.8 in (8%) longer. The height of the trunk opening is the same for both models.
The largest and most relevant difference concerns the depth of the trunk (measurement from the loading edge to the trunk floor): the VW ID.4 is 1.6 in, or 67%, "deeper" here than the Nissan Rogue Sport.
Other differences are minor: the loading edge of the Rogue Sport is 1.2 in (4%) higher above the ground, the narrowest trunk width is 1.2 in (3%) greater in the Rogue Sport, and the opening width is 2 in (5%) wider in the Rogue Sport.
Impact on Usability
Because the depth in the ID.4 is significantly greater, it offers more usable vertical capacity in the trunk: bulky or taller stackable items can be placed lower without protruding over the loading edge.
This increases the overall storage capacity for voluminous cargo. Additionally, the ID.4 has a slightly lower loading edge (Rogue Sport +1.2 in), which makes lifting heavy items easier.
The smaller advantages of the Rogue Sport in width and opening (each a few centimeters) make loading very wide items somewhat more comfortable but only noticeably affect practical use with precisely fitting, wide cargo.
Overall, this means: for taller/voluminous cargo and easier lifting, the VW ID.4 is preferable due to its significantly greater depth and lower loading edge; for occasionally storing especially wide items, the Rogue Sport can offer a slight advantage.