Trunk comparison: BMW X4 vs VW Golf Wagon

Key Differences
The VW Golf Wagon offers advantages over the BMW X4 in several dimensions that are noticeable in practical use.
Particularly noteworthy are the following points: the height of the trunk opening is +3.1 in (≈11%) higher in the Golf Wagon, the trunk depth (loading edge to trunk floor) is +1.2 in (≈38%) greater in the Golf Wagon, and the loading edge of the BMW X4 is +7.1 in (≈30%) higher above the ground than that of the Golf Wagon.
Smaller differences—such as the longer loading length of the Golf Wagon with folded seats (+5.9 in, 9%) and with the first row upright (+2.8 in, 7%) as well as a trunk opening width that is 1.2 in wider on the BMW (+1.2 in, 3%)—exist but remain below the 10% threshold and are therefore less significant.
The narrowest width differs by only 0.4 in in favor of the Golf Wagon.
Impact on Usability
The higher trunk opening and greater trunk depth of the Golf Wagon make loading and storing tall or bulky items easier: the larger opening height allows taller cargo to pass through more easily, and the additional depth creates more usable storage space behind the loading edge.
Together with the lower loading edge of the Golf Wagon, this means less lifting effort and more convenient loading and unloading, especially for heavy or bulky items.
In the BMW X4, the significantly higher loading edge negatively affects everyday usability when loading: lifting luggage or boxes is more strenuous, and long or heavy items are harder to load close to the ground.
The slightly greater width of the trunk opening in the BMW (≈1.2 in) can help slightly when maneuvering very wide items but is insignificant compared to the disadvantages of the higher loading edge and shallower depth.
In short: For users who frequently load and unload tall, deep, or heavy cargo, the VW Golf Wagon offers noticeable advantages due to its higher opening, greater depth, and lower loading edge. The BMW X4 scores little in relevant loading characteristics and requires more effort when loading.