Replying to Atomic bent 100 or 90

I'm gearing for the new season here in Sweden and looking for a new set of skis. I'm looking at the Atomic bent series as a pretty good fit for me, I like to ski everywhere on the mountain from carving to backflips in the park to offpiste skiing. I don't really want to buy more than one pair of skis so I figured the Atomic bent series would be a good fit. I'm 18 years old, 175cm (5'9) and 70 kg (155 lbs) experienced skier. Sould I get the 100's or the 90'sand how well do they carve and which lenght should I go with?