Evade or Defence for traps

[Shadowdragon]

When a character sets off a trap, would it be better to have them make an Evade flip or a Defence flip to avoid said trap, or does it really matter which one they use? I'm just trying to figure out if there is an actual use for the Evade skill beyond just being a way to determine Defence. If Evade is used would the damage flip still get an accuracy modifier? In the rules it says an accuracy modifier is only applied if the attack was an opposed duel. TTB doesn't really make a distinction between opposed duels and unopposed duels, all duels in TTB are just considered simple duels, so would an Evade flip made to avoid being hit by a trap be considered an opposed duel for accuracy modifier purposes?

[Mason]

Generally, I use Defense for when someone is attacking you, and Evade for when things are happening in a more passive sense (such as with traps).