This blue/green ball is not easily found once lost.  I find the orange/white ball is much more easily spied in the grass or water.  It also has the advantage that it glows in the dark which is important as we have shortening days & then lose daylight savings time.  There is no compelling reason to prefer the blue/green coloring.  The orbee ball is super!!  The dogs love the squishy, chewy quality. The rope lets me throw it farther, however I don't like the tied rope. I find any loops to be dangerous for active excited dogs. When I 1st get the orbee ball I get the knot outside the ball, undo it, put a metal washer on the rope.  I then  knot the end of the rope & push the knot in 1st, followed then by the washer.  Now I cut the rope to the length I want & put a knot at the end so that I can play tug with my dog.  There are admittedly better tugging balls-specifically the rope wing-a-ding ball by Booda.