In the Catskills you have 4 choices: Hunter, Belleayre, Plattekill, and Windham.
Hunter has the most advanced and varied terrain. Also the best snowmaking. I ski there every week.
Belleayre has good mogul runs and a steep but short top section. It's a ridge, all the runs run straight down from the top. The beginner area is at the bottom but is seperate from the top, it's own area with seperate lifts. Nice bar in the lodge too. Less crowded than Hunter.
Plattekill is the no frills area and also the farthest north. They get way more snow than anyone but have the least snowmaking. Not having a good season this year and there is NOTHING around it for miles.
Windham is kind of like Belleayre but ritzier. They cater to a more upscale crowd. The terrain is pretty much a steep short top section then blue the rest of the way down. They have another peak with 2 diamond runs off to the left that are Ok. Haven't been there in a while.
My pick is always Hunter, except when Plattekill gets a huge dump.