Transparency:
Everyone participating has full view of what is being done. Nothing is hidden from anyone
Security:
There are multiple copies of the sama data all over the world, and because the blockchain is immutable and can only be updated if consensus was reached, this makes it super secure.
Improved traceability:
If all your suppliers down the supply chain also make use of a blockchain, then its very easy to trace where your asses have been.
Increased efficiency and speed:
Because everything gets recorded on the blockchain, its way more efficient and speeds up the whole process compared to how we have been doing it now for decades.
Reduced cost
Because using a blockchain is so efficient, and because its like it auto audits itself, and because its trustless, and we only need to goto 1 place for all our questions to be answered, it results in enormous reductions when it comes to cost.