The white one is good, and that one is from the second generation of national armor (it seems to be), so it can be screwed up more smoothly.

It's the first time to buy black ones, although they are not sold in regular stores. I bought it in an ordinary shopping mall selling educational toys. It feels awkward and astringent.

Later, I bought a white one with instructions in it. It's smooth and feels great.

The difference is that their models are different. The black one is the early Rubik's Cube, and the white one is the later improved version.