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If adaptability floats your boat (mirrorless, Canon mount,....) the Samyang gives you aperture ring. You can also have Nikon G-lens adapters with aperture control but is not the same (at least the cheap ones I have used).
Also, I dont know how the focusing ring of the 1.8G is, but if you are into using the camera for movies, the focusing ring of the Samyang might be better.
Still, if I had to choose one lens today, I would go with the Nikon 1.8G