IFS Cloud 22R2: Calling CRUD methods in a service package(SVC) from another Custom Service package

Hi All,

I need to create a Custom REST API and this API needs to call several other REST APIs.

For example new custom API is Test_Handling_SVC.

My question is , do we normally call CRUD methods in standard SVC packages from other SVC packages (say custom SVC) or should we call standard New__ , Modify__ method calls instead.
e.g.
Do we call method 
Prepare_Work_Order_Handling_SVC.CRUD_Create() 

OR

Active_Sepatate_API.New__()

What is the recommended IFS standard?