Replying to Comparing FX Carb & Darkside Titan flex

Im aware that both of these models is exact same and FX 7.3 contains 15% more fiberglass to ensure its stiffness. I'm wondering which one have lot more stiffer flex- Darkside Titanium or FX Carbon? My local shops doesnt sell FX so I cant really just go out and compare them.

I'm looking for a pair that can handle high speed, wont chatter on ice much, and can ski switch too. I already have 171cm MN Pro and its not that fast, so its better used in the park.