I build my own wheels, but a machine built wheel using good components is better quality. That is because all the spokes are tensioned to an exact torque figure at the same time. There is no way you can do that by hand. However, most machine built wheels use the cheapest components and are not good quality, not because they are machine built, but because they are cheap wheels.

Of course, if the robot goes wacko, you can get an awful lot of bad wheels before someone notices.