  The uniform motion of chiral magnetic skyrmions induced by a spin-transfer
torque displays an intricate dependence on the skyrmions' topological charge
and shape. We reveal surprising patterns in this dependence through simulations
of the Landau-Lifshitz-Gilbert equation with Zhang-Li torque and explain them
through a geometric analysis of Thiele's equation. In particular, we show that
the velocity distribution of topologically non-trivial skyrmions depends on
their symmetry: it is a single circle for skyrmions of high symmetry and a
family of circles for low-symmetry configurations. We also show that the
velocity of the topologically trivial skyrmions, previously believed to be the
fastest objects, can be surpassed, for instance, by antiskyrmions. The
generality of our approach suggests the validity of our results for exchange
frustrated magnets, bubble materials, and others.
