Well I can tell you from years skiing in Telluride that Spring skiing is fantastic. The snow is nice and soft, the weather is great, the lift lines minimal if non-existent and overall an amazing experience.
If you're looking for pow, it's a crapshoot. Sometimes the spring weather brings a few big dumps, and a other times snow doesn't fall for weeks.
The park is the most fun during the spring. All of the features are set up, the landings are soft, no one is really there, and the sun is out till close.
Hopefully that helps