My opinion, don't bother wasting a day at Timberline. You'll be disappointed you wasted part of your trip leaving Snowshoe. Though it has been a long time since I have been to Timberline, I know the hill couldn't have changed enough to make me go back. Hell, I'd rather ride Canaan than Timberline and Canaan is super small.
If your already at Snowshoe don't bother leaving to go ride anywhere else in the Mid-Atlantic b/c your already in the best spot by far. The closest spot that even compares is Seven Springs PA, but I would put Snowshoe well above them too.
Note, this is a comparison of terrain only.