Targets? Pesting? A little of both? The edge goes to the Diana for build quality but the 95 is still a well built rifle. I've had both: the 34 in .177, the 95 in .22. Also not a clue how good the 34's are now that the Chinese are involved, so should you choose the 34, I'd say try finding an older one.
-While it's not a T06, the Quattro is still a real nice trigger and very adjustable.
-Quieter goes to the Hatsan unless you want to moderate the 34.
-Ease of tuning goes to the 34, they're one of the easiest springers to tear down and tune with any number of aftermarket kits and springs available depending on the power level you're looking for.
-The 95, even being a gas ram, can still be tuned to make it a smoother shooting rifle and can even be converted to a springer later on should you choose to, but Hatsan is the only real source for parts. There's not much aftermarket unless you want to buy from the Russian guy on Ebay.
Probably didn't help your decision much, just my random lame thoughts.