Haven't been to Stratton, but have been to Killington. Was a bit disappointed in the vertical. I feel it really is half the vertical it's marketed as with only a green trail going from top to bottom.
Not to say it's a bad mountain by East coast standards, but I much prefer the top to bottom runs you can find on Stowe.
It's also one of the resorts on the east that really should be rode on the weekdays as find the lift lines very long and slopes very crowded on the weekdays.