[netr0ute]

Here's why you should use the active voice:

1. It lets you know who/what is performing the action, instead of leaving it to the reader to figure it out.

2. It makes the writing less repetitive because each descriptive word becomes a verb, instead of "to be" being in every sentence.

[cudgy]

Personally I find active voice to be more repetitive as it tends toward a similar sentence structure of subject-verb and can also imply certainty in situations that are more nuanced. However, active voice and simple sentence structure should be used when possible to avoid redundant, flowery language.