Data-oriented is the way to go IMO. I am using the latest version of C# and our current domain models use zero inheritance. We also do not allow for any sort of

Data-oriented is the way to go IMO. I am using the latest version of C# and our current domain models use zero inheritance. We also do not allow for any sort of complex type nesting so composition is also constrained. In order to relate complex types together, foreign key properties and dedicated relation types are used. Every domain type we have can be mapped to & from a relational table without any difficulty. This is important because we use SQL for certain parts of the product. Turns out this kind of compatibility has tons of other benefits that you may find value in (we certainly did).