That depends on your delivery chain. For tumbling down a conveyor at a sorting center, getting thrown around, fall damage, cuts, slashes, sliding over rough sur

That depends on your delivery chain. For tumbling down a conveyor at a sorting center, getting thrown around, fall damage, cuts, slashes, sliding over rough surfaces, etc cardboard is vastly superior. For sitting out in the rain plastic is better. It might just be that Amazon delivery chains in the US looks very different from most other places. A US package might never see the inside of a DHL sorting center, but spend a lot of time outside, making plastic a valid choice. A package in Europe on the other hand won't see more than two minutes of rain but a lot of rough handling designed for cardboard boxes, making plastic a suboptimal choice (even before environmental regulations)