I have play fs, wr and gh and i have test different set ups these years. I wanna told u that best pve dagger class is fs and best pvp class is gh atm.
If u open the passive skills each class u will see the difference but if make ur tests u will realize better the difference. A lot ppl tell that dual daggers are best but i will agree only in the pve part in that. Single dagger is best in pvp and in oly. I have test +12 limited dual daggers and +12 limited shaper. Shaper have faster skill animation and if u go back to the enemy the damage is bigger than dual daggers. I have test it with same sa kain 8 x2. Also the vital point seems to me that work better with shaper.
Now, for me if u have the adena take dragon shaper since u can put the kain sas in dragon weapons.. Valakas shaper in ghost hunter with good gear and kain x2 death, fire and shillen leave dead bodys.. One shot from back.. The damage is awesome.. Pve is another story and better use dual daggers cause of the auto hunt macros. If u want further advives u can take from lorekraf or divekio.. Are some of the end game daggers in chronos..
Thats my experience maybe i am wrong but i think shaper for me rocks...