That said my experience is that it is not very thorough.
It may be related to the amount of money I paid (well over 200 euros vs. less than 100 US dollars) but my initial JAA Class 2 indeed felt far more thorough than my initial FAA Class 3. Took a hell of a lot longer too - half a day vs. less than one hour.
Does that lead to a better prediction about my medical condition in the future? I honestly don't know.