The United States and Canada have a tremendous variety of places to enjoy your upcoming ski vacation. The main differences of the various places are attributable to where the ski resort or ski area is located. Those areas located in western mountain ranges along the Pacific Ocean are impacted first by storms coming in off of the ocean laden with moisture and heavy precipitation. 
These ski resorts will see dense moist snowfalls that can dump many feet of snow in a day. This snow will be wetter and denser, but for these far western ski areas it will be more abundant allowing for more accessible skiing locations. The skiing seasons will be longer as well.
As the storms travel east with the jet stream over the Nevada desert and Great Salt Lake, it deposits snow in the Utah mountainous region. In this continental climate, the snow is light, dry and fluffy, and is considered the best snow in North America with Colorado and Wyoming a close second in this regard. Simply put, you will ski better on this snow! With spectacular alpine terrain, it is no surprise that there are more major resorts in Colorado and Utah than the rest of the Rockies put together.
When the ski areas of the Rockies are compared in a north to south direction, the Canadian Rockies will have colder temperatures ensuring snow coverage that will last longer. Heading in a more southerly direction, the ski locations in the northern part of New Mexico receive the same quality of snow, but with less overall inches in a given season.
The New England ski areas cannot compare to the western states in quality and quantity of snow, nor in technically adventurous slopes. They are however very popular, particularly with the populous areas of the Northeast. Vermont is considered to have the best skiing conditions in the New England region.