I think Sheffield racks are superior from a usability-standpoint, and potentially from an affordability-standpoint as well. They may be worse from a space-efficiency standpoint, however.
I realise that there are a lot of bikes in the Netherlands. I know bike theft is also a pretty big problem. Introducing some Sheffield racks could go some way to mitigate the issue.
I imagine there's still a not-insignificant amount of car parking that can be removed to make up for the relatively larger amount of space that the Sheffield racks require.