I've just found out this webpage, which is, by far, the most complete resource for information about sticks, buttons and arcade controls in general, specially because the precise data it offers and the wide range of sticks and buttons it analyse, including American, Japanese and European controls. Not only does it describe and offer exact data about every piece of hardware, but also features articles about recommended sticks for every arcade game genre, commercial control panels, a construction guide, ergonomics about the pushbuttons, information about the makes, an impressive demonstration about the methodology used for analysing the controls, and much more. The only problem is it's in Polish, so it's almost impossible to understand anything, even with the help of online translators. I wonder if there's any similar project in English or if somebody has translated or summarized the contents of this site.
The url:
http://www.kowal.itcom.pl/ArcadeParts_pliki/Joysticki.htm