After spending years working on becoming fairly good at one sport, giving it up to invest time and money in one where I don't shine isn't exactly appealing. But if boarding were as amazing as its fans claimed, I would have gladly made the switch. Skiing just does more for me. Boarders enjoy the increased sense of freedom they experience when they ride. The thing is, I don't want to ride, I want to drive.
Skiing offers more control, which allows one to be more aggressive.
And for me there's no bigger rush than slicing through the moguls in a series of aggressive, tightly executed turns. But that's me. Many prefer the quicker learning curve of snowboarding and the speed and feel of riding one board. I can see the appeal. On powder days I find myself imagining floating over the freshies on a board, and I never walk by a half-pipe without thinking it looks like fun.