Customer Component Repair - Shop Order or Work Order with/without CRO

Community,

Wondering what is the best option for customer component repair, Work order or Shop Order?

We are using APP10, Products are manufactured in house and ship to customer. If customer had issues with the product, it will be transport back to our shop floor.

Question: 

1. will CRO applied to our scenario?
2. Repair shop order or Work Order, which one is better? we do have both 2 modules installed.
3. if no CRO, which is the best option to bring the customer products back to our site with customer owned ownership?

Thank you.