The primary difference between the White Bird of Paradise (Strelitzia Nicolai) and the common Bird of Paradise (Strelitzia Reginae) lies in their appearance and size. Strelitzia Nicolai is larger, with white flowers and more tree-like form, while Strelitzia Reginae is smaller, featuring bright orange and blue flowers. Both species share similar care requirements but are distinct in their visual appeal and growth habits.