It can be served as either.  As light supper, it’s great as a main dish.  For a brunch spread or holiday meal, you can serve it alongside other dishes as a side dish.  It would go well with a large piece of salmon, or a smoked fish tray.  Noodle kugel could also be served along with quiche, fruit tray, and a bagel bar for a great wedding shower brunch or mother’s day brunch idea.