Wow, I Don't Really Give a Van Damn did a great job at explaining the two.
I am Female, 5'4, 120 pounds, similar to you, and I got myself a Lib Tech Skate Banana (pink and green) at the end of last season for $365. It's true, they do not make models for females, but this board seems to say different. Like I said, it's pink and green... Also, it's a size 148-Narrow (I wear size USA 7.5 boots), which also makes the board more custom for us females. This board is amazing. It's a flex rating of "4" so it's one of the most flexible boards on the market. It rides smoothly over bumps and other obstacles, but I love that as you turn from heel to toe side, and back, you can start shifting one foot before the other, keeping your edge hugging the mountain the entire time and your feet completely in control. I'm not sure if I can explain what I mean well enough... Like you can start to flex your front ankle while your back is still pointed a bit (as you go from toe to heel side) and complete the turn. The board's edges really never leave the mountain.
I just had my front knee's ACL reconstructed in early June, after tearing the ACL and meniscus on a jump in the terrain park, on St. Patty's day last season. As I faced a major surgery, and wanted to be able to ride a snowboard again (even though it forever changed my knee), so I looked into boards that would take the pressure off my knees. I lost a lot of my snowboarding ability from the surgery, but the little I can do, I swear I attribute to my Skate Banana. It glides through our Arizona ice, yet keeps it's tip up really really well in the power in the trees. It absorbs some of the shock from little rough patches. I haven't been able to hit boxes or kickers in the park yet this season, but my physical therapist thinks I will be ready by mid-February. So I cant vouch for it's ability in the park, but from what I can tell, it will live up to it's name.
My boyfriend took a video of me on my first day back on the mountain after surgery, after being able to actually "carve" again. While I'm not too good because of surgery, if you watch the board you can see how it's edges really never leave the snow.
http://www.youtube.com/watch?v=nNqAXK3oNZo
Hope this helps