A short answer would be all of them but in their own specific way. Among all benefits of EDMS, the most prominent and easy-to-spot one would be definitely cost reduction, since you would be able to see the results almost immediately. And these results are quite tangible – literal money that you can redirect and use to hire new specialists or buy new equipment for your core activities.
However, we would also like to highlight increased productivity that would allow you to develop faster and reach your target goals.