  We profit by a recent paper of Visser claiming that Rastall gravity is
equivalent to Einstein gravity to compare the two gravitational theories in a
general way. Our conclusions are different from Visser's ones. We indeed argue
that these two theories are not equivalent. In fact, Rastall theory of gravity
is an "open" theory when compared to Einstein general theory of relativity.
Thus, it is ready to accept the challenges of observational cosmology and
quantum gravity.
