I can't decide which direction to go in for NaNoWriMo

I've been mulling this over these past days, but I just can't make up my mind. I have two ideas for NaNoWriMo, and I can't decide which one I would rather do, because one minute I want to do one idea, the next minute the other idea. It would be cool if you guys could pitch in as to which idea you find more compelling.

 

  1. Fairy-tale like erotic fantasy with a mystery. I know, it sounds like too much of a mix, but I have this idea of a princess disappearing, and her maid, who can secretly do magic, posing as her to find out what happened. Meanwhile, she is also in the castle as herself, and uses seduction to gain information.
  2. Dystopian story. This one isn't thought out so much, but I've had this idea bouncing around in my head for a while. It's about someone who becomes a leader to make the community better, but ends up as the evil tyrannical leader without realising it.

 

So, what do you guys think? Which one would you rather read?