Moutain is about a 2000 vertical drop. Easily 2 to 3 times as tall as any place you've listed; wachusett, MD(wisp),PA(white tail, round top, liberty). Blue and Blacks obviously vary from mountain to mountain. So some runs that might have been black at those locations might only be blues at Stratton. I haven't been to those PA locations to say but I know this was the case when comparing soem Blues I ran at Shawnee versus all the places I've been to in Vermont.
Expect lots of people on Saturday. Thats because there are lots of weekly bus trips that make their way up there from NY, CT and MA locations. The Sunbowl side typically sees less traffic on the trails as most people gravitate to the main base side