Move Order Transfer vs Sub-Inventory transfer

The difference between move order transfer and subinventory transfer is
In move orders, you can have an approval so you are not simply "taking" material from a subinventory that is under someone else's control.

Also, move orders create allocations. So you can place hold on the material with the intention of picking it up a little later. In subinventory transfer, there is no reservation / allocation. So until you actually pick up the material and perform the transaction, someone else can claim the material.