I’ve only been to Dutch Springs once, but it seems to be by far the best of the quarries in PA. Bainbridge is very good also, but not quite as clear or conveniently arranged. Guppy Gulch is pretty nice also, but the services are fairly limited on-site. On the plus side Guppy is usually very uncrowded and laid-back. I’ve never been to Willow Springs - I understand there’s a fair amount to see, but the viz is very poor.