What are the best movies without any plot twists?
It would be hard to imagine any movie, even a "short subject," without a twist to the plot. It would have to be a film without a plot, let alone a twist. A documentary, for instance, immersing the viewer in a particular way of life: something to be witnessed for its own sake.
For example, the 1929 experimental film Man with a Movie Camera, an almost kaleidoscopic view of life in a big Russian city. Scene follows scene, quickly and independently, with no story line.
Or the first film in a series known as the Qatsi trilogy: Koyaanisqatsi (1982), with frenzied images of modern urban civilization. You could call the succession of images a development, or a plot; but there is, at any rate, no twist.