The SKB case does not seem to have any wheels, which makes it cumbersome to handle particularly at this day and age. I think that 2 wheels in the B&W are already a serious flaw. However the Foldon seems to have 4. The whole premise of hard over soft is misguided in my opinion as life operates on compromises. In real life my Brompton suffered more damage in the hard B&W case than in the soft Vincita. Sightseer and B132 are one and the same, just Sightseer comes with a garment bag. The model evolves over time and its model number can evolve too.
The SKB has two well protected wheels, and a handle that retracts along the side.
Here's why I went with a hardcase,
All parts are also available (if in stock of course) for replacement.