Scheduled SOs/POs - use multiple lineitems or multiple releases?

Scenario: customer submits an order for qty 200 of an item, that they want shipped in 10 lots of 20, each shipment scheduled 2 weeks apart.
This also results in a PO being created to a vendor for components on a similar scheduled basis.

Q: Any best practice recommendations on using multiple scheduled lineitems vs. 1 lineitem with multiple scheduled releases? This question is for both SO’s and PO’s.

1 line item per part#, multiple releases.

Unless this confuses the customer…in which case you do what you must.