Ski Flex?

I'm not an expert on this but you want soft for the park and stiff for all mountain.  So I am assuming you would want a stiffer ski for powder.

It depends on what you like, how you ski, and where you ski.  For powder only where you don't think you'll get into ice, tracked up stuff, or wind-affected snow a softer ski is usually best.  If you're dealing with variable snow densities, depths, etc a stiffer ski is usually better.  But it really all depends on what you like in a ski.  Just remember softer skis tend to float better but chatter easily, and stiff skis will plow through weird/bumpy snow and hold an edge better at the cost of some floatation.  That's why we have powder skis ranging in flex from the Pontoon to 194 Squad--"powder ski" is a highly subjective term.

Stiff if you ski hard, soft if you ski easy.

My only experience with softer pow skis is some Zag Golds (about 100-110 waist I think). They were cool for cruising around but I couldn't get much out of them if you know what I mean. I took a few drops and they just gave out on landing, I didn't like that at all. I didn't like how much float they had too - skiing powder because like skiing groomers because I was totally on top of the snow. This was in February 05 in Whistler on 6-8 inches fresh moist snow. I don;'t think I'd ever get a huge ski unless I skied Utah or somewhere with really light pow.