The key differences between espresso and pour-over coffee include the concentration, brewing time, and the fact that espresso is often the base of a milk drink. Espresso is brewed at a one to two ratio, while pour-over coffee can be brewed at anything from one to fifteen to one to eighteen. The amount of total dissolved solids is eight to twelve percent in espresso and in pour-over coffee it's usually around one point two to one point three. The time it takes to brew these two kinds of coffee is also very different, with espresso taking around 30 seconds and pour-over coffee taking three to four minutes.