Seems like we got the same Ideas, my choices were Whitefish or Jackson Hole for my Feb. trip. I have never been but a friend went and didn't like it because there were a lot of tracks and flat areas and a little more skier friendly? Maybe they just didn't go down the right runs to avoid all that. Post up videos of you dropping in on Corbet's Couloir when you get back though.
Of all the reviews I've read about Jackson I haven't seen anything complaining about it having lots of flats. The opposite actually.
As an aside I went to Whitefish last March and had a blast. Loved riding in the trees there. The locals were awesome as well. Only thing I have to complain about was the fog. It was foggy 3 out of the 7 days I was there. My last day we had to cut short because no one could see their hand in front of their face.