Before revision:  We find that while the speeds of these two mechanisms are roughly the same, the precision of emergent chemotaxis is higher than that of individual-based chemotaxis for one-dimensional cell chains and two-dimensional cell sheets, but not three-dimensional cell clusters.
After revision:  Here we consider collective movement that emerges from cells on the exterior of the precision of emergent chemotaxis is higher than that of individual-based chemotaxis for one-dimensional cell chains and two-dimensional cell sheets, but not three-dimensional cell clusters.