The EVO is better overall in my opinion. The Zalman coolers 9500/9700 had their day a couple years ago now, and while they are still decent coolers, the EVO is better. If you were talking about switching from a 9500 to the evo I would say it's not worth the money, but if you are buying one or the other then my vote goes to the evo.
EDIT: Geeze Novuake, I'm really surpried there is that much of a difference in the 9500 and the evo. My 9700 LED is still allright being only a few degrees higher than the evo, but the 9500 is almost 15 degrees higher.