You can use 300' and 2km if you don't intend to return to the departure airfield in the event of an emergency (engine failure for example.) With light twins having quite poor performance on one engine, most people plan to use the departure airfield as their emergency field and so the take-off minima becomes the landing minima for the most appropriate approach, or weather sufficient to allow for a visual approach if there is no IAP. The presence of ATC and controlled airspace is not directly relevant.
With that in mind, I would use the landing minima if in a single as well. So I can return if I have a partial engine failure or something.