Nikki, The main difference between the BetaRide 10.20 and the BR 11.20 is the 11 has titanium Powerchannels, and the 10 has carbon Powerchannels. To say one stiffer over the other is hard to quantify. They flex differently, such that the 10 flexes easier and seems to be less demanding. That is not to say that the 11 is a demanding ski, but it works better for aggressive skiers. Also, the titanium aides in damping the ski, so the 11 is better on firm snow. At the end of last season, we had a number of this seasons 10.20s and 11.20s, and the women prefered the 10 because they were easier to ski. My assumption is that women, even aggressive experts, ski with more finesse than men. I hope you can demo so that you can make your own decission of which will work best for you.