When you are designing PCB, you definitely are looking for without sacrificing quality under the premise of cost reduction methods.
Therefore, in order to help you, Jane
Automatic and manual of printed circuit board assembly no matter you choose automatic assembly or hand your order of the printed circuit board assembly, choose will ultimately affect your budget and production time.
If you need to make a small amount of PCB, manual assembly is a viable option.
Mass may need to automatic assembly, however, because it can be more cost effective.
Also consider the fact that your run quantity not only depends on your order quantity of PCB, still depends on the number of each component on the PCB.
Turn-key Electronics Manufacturing Services for Printed Circuit Boards and Assembly