Replying to PE 169 or 174!! please help me to choose the rigt one

Hi guys,
i need some help to choose the right lenght of my new ski.
i decided for the PE (i can find a great deal with that)
So my stats are 147 lbs (66 kg) , height 5.8 (177cm)
I ski quite agressive but I'm a beginner in park , and i'm not a very muscular type
So the choice is between PE 169 cm or 174 cm!!
what do u think about?

(i skied on an armada ar5 180 this year, great ski but it looks "too much" for me)

Thanks a lot