Good Vs Evil

I love the concept! I'm writing a book that is ultimately a defining of good and evil. Meaning: Can you tell them apart at their extremes? Both armies want to end the chaos in Creation and bring peace, but both have similar methods. One is composed of races that once wanted to destroy one-another, and villains hiding from destruction; the other is lead by ancient beings originally created to lead Creation and teach the younger races. So who can be trusted?