So the only difference is that Greens have the little click sound and clear doesn't?
No, the tactility is also different. The Greens (and Blues) have a small but sharp bump near the middle of stroke.
The Clears have a large but not so sharp bump at the beginning of the stroke and then a valley right below the actuation point after which the resistance rises sharply.
I have too little experience with the whites (I have only one switch) to be able to compare them to greens.
Just to clarify, white = 'milky', or would that be clears?
Chinese keyboard jargon is confusing ... MX Clear = "White switch" and MX White = "Milk switch", even though you think that it should be the other way around.
Even more confusing is that some vintage MX White look exactly the same as MX Clear and that some vintage MX White have the same resistance as MX Blue ...