I am a 160# guy that's gonna ski the ST12 in a 155. Here's the thing. Yes, the SL12 is stiffer. And 200+#, 6foot something inch-tall gorillas ski it in a 165. I know about the race stock thing- stiffer probably yet.
The ST is the SL with power-rods instead of power-channels. hence, more flexible. The mounting plate is NOT forward 1cm like the women's line. I would imagine the FIS World Cup women's model will "look" loosely like the ST12, but as you would expect, it's probably an SL race stock. If you are racing FIS like courses, and you are the size of an FIS male with quads to match, go with the red one. Or maybe you are a large person anyway? For the rest of us, blue will work better I expect.
If you can move past the idea of blue being a girls color, it might work better for you. Besides, I thought it was pink(girl) and blue (guy)?
I dont see the LT-ST line as being a women's ski. I see more and more "finesse" skiiers with em on the FIS circuit. The GS12 and ST 12 construction is the same exept the ST is pretty much softer and they dont come in the same sizes as the GS. I am talking about Stock versions here. I know nothing about the consumers. IMO the ST is a much more "relax" ski. I know that is what I am going to switch to when I go for my coaching levels.
If we were talking about sub 100 point racers, the ST, LT might be considered womens skis. However, for mere experts, club racers, or masters that are not likely to make the Nats (or are in higher age brackets) the ST/LT can be used by men also.
I haven't skied a race course in anger in over a decade, but I'm toying with the idea of training a little this year. If I do, I'll choose an LT.