IEnumerable without data

Question

If I have a method or a property that returns an IEnumerable<SomeType> that leads to no data, is it more efficient to return an empty array new SomeType[0] or is it better to return an empty list new List<SomeType>() or is there an even better solution (IMO building an own type with generics could be such a solution but it seems to me a little bit overkill)?

The array is my favorite but what do you think about this?

Answer 1

Return Enumerable.Empty<T>().

Answer 2

Two ideas:

IEnumerable<SomeType> returnedValue = SomeProperty;
if (returnedValue == null)
{
     //it means it's empty
}

Or it can be done, like Mehrdad Afshari said to return Enumerable.Empty<T>().