It should not be a clear choice/consequence EVER. You should be given multitudes of choices and just as many consequences.
For example:
Simple rat quest
- You recieve quest
END- You kill the quest giver- You are banished from a guild if in one, you grow a red pulsating vein on your forehead, You can get a tattoo of you impaling the quest giver
END- You assassinate the quest giver- Quest ends, you get a red pulsating vein, you remain in guild
END- You poison the quest giver- Someone else is blamed, a battle breaks out in the guild. You can get a tattoo portraying you as an instigator
END- You attack the quest giver- You are removed from the guild
END part 2 V. 1- Another person completes the quest
END part 2 V. 2- You complete the quest anyway, the other recieves reward, you are added back to the guild if the person you attacked has a high liking of you
END part 2 V. 3- You kill the other person- The guild makes you an enemy and actively hunts you
- You go to the person's house
END- You kill that person- The quest giver removes you if disposition is less than 90
END- You attack that person- You fail the quest, you are given another
- You complete the assignment
END- You disgust the person by dragging them around or spreading the blood on purpose, quest giver is dissapointed
BONUS- You do not damage anything
BONUS- You help the owner fix damaged things
BONUS- You convince the person to put in a good word for you
- You return
END- You complete the quest successfully.