In my opinion calling citizenship is more beneficial. It opens possibilities of more rights and privillages in the future. Nrn card was already more like a green card. It gave some privillages but not exactly rights. For example you could ask for visa free entry to Nepal but at the discretion of the officer at the airport to grant or deny one.
I think we should stop giving it names such as green card or 3 rd class citizenship etc because its not one but the ill minded people in Nepal would start to treat like it was one if we- ourselves continue to believe so.