Although Mt. Baldy is much larger than any of the other socal resorts but requires much more mountain driving, offers less terrain park features (which is very popular to californians who are predominately younger and snowboard), has little to no snowmaking (were only able to open a few trails until they finally had a good snowfall this year), and is more of a mom and pop resort. I really want to visit Baldy sometime because 2100 feet of vert must be great and i have heard that they slopes are extremely challenging.
Here are the stats of Mt High:
Vertical Rise: 1,600 feet
Skiable Terrain: 290 acres
Permit Terrain: 515 acres
Average Annual Snowfall: 210 inches (8yr average)
Average Length of Season: Early November - Late April
Much better than any resort in NC let alone the east coast (excluding upper New England). Also, the 290 skiable acres (excluding the unmarked areas with great tree skiing) is much more than the 70 acres at Sugar Mountain.