The active voice is much more direct and easy to follow, compared to the passive voice.

For example, notice how much easier it is to read the active voice in these examples.

Passive voice: Every customer should be greeted

Active voice: Greet every customer. 

Passive voice: The forklift should be parked in the designated area.

Active voice:
Park the forklift in the designated area. 

ProTip: Typically, when using the active voice, the subject of the sentence does something.