Everything you ask all comes with an asterisk....how much snow Timberline gets throughout the season.
Great snow year...long public park more features
bad snow year....smaller public park less features
Summer ticket prices: Summer passes 2 years ago were around $900 day lift tickets were around $50 a day(i could be way off on daily lift tickets)
Public Terrain Features vs Windells park: The best way to solve this issue is to watch summer edits. The Hood Crew and then Windells session edits would be a great start. If someone is hitting a feature that does not say "Windells" or "MHSC" then most likely it is public.
Location....: Once again this falls in the asterisk category. Usually Windells is above public however still on the "glacier."
Overall Experience: I worked at Windells for the 2010 summer. In June the Public Park was awesome super fun jump line. July hit and It got smaller and smaller and eventually you could not lap public by chair but had to hike it. I think you will be safe if you are going in June just watch the snowfall on Timberline. If you do go you will not regret it. My advice if you can lap the park buy a lift ticket. If not hike and save money.
Typed on my phone hopefully that all makes sense.