In terms of scalability would be wiser to make an object from the concrete class or the interface? [closed]

Question

For example instead of:

LinkedStack<Integer> list = new LinkedStack<Integer>();

Should be this:

StackInterface<Integer> list = new LinkedStack<Integer>();

Answer 1

In my opinion:

LinkedStack<Integer> list = new LinkedStack<Integer>();

is better only if you need specific methods on LinkedStack that are not declared in StackInterface.

StackInterface<Integer> list = new LinkedStack<Integer>();

is better if you do not, because then you can 'plug in' any implementer of the interface for different reasons (efficiency reasons for example).