Neither will have all the epicness of the summer sessions. There will be no private park for either, and most of the outdoor stuff will be unusable. In fact, MHSSC will almost certainly be under several feet of snow by that time. There will be hardly any campers compared to summer, and the normal coaches will be mostly gone at their winter homes.
All that being said, the public parks at Skibowl, Timberline and Meadows are pretty good and you will likely get to ski pow. You may not even want to ski park a good amount of the time you're there or the park may get buried. Winter conditions are a whole lot more variable than summer. I think you'll have fun no matter what, but MHSSC will likely be cheaper.