what skill on DW give the biggest damage

hello all, i wonder what skill on dw that give the biggest damage ??

and how much damage of each stat that we take to main and seccond weapon
str ??
agi ??
dex ??

and the last question is on dw skill is it use the combination of the main and the seccondary weapon or only the one that writen on stat screen ?? becouse we cant see each weapon damage

 

Hesitant to reply to this, since I'm pretty sure there are some threads/guides that answer some of these but~

Spin Slash, Twin Slash, Phantom Slash, would be the main dmg skills ( and Charging Slash)
Phantom Slash has a high risk (skill misses, boss/mob evades, etc) >> low reward (if your combo works/or the skill crits/etc)
Twin Slash would be your go to skill for consistency/burst DPS skill
Spin Slash is underrated, great when prorated, imo CAN be used as DPS, but more so as Utility
Charging Slash, don't really use so I can't say exactly, but it does get pretty high
For straight up dmg though to answer your question, you could choose between Twin Slash and Phantom Slash

Str- +1 to your main and sub
Agi- 1+ to your sub (might be wrong on this one)
Dex- +2 to your main hand

For the skills whether or not it associates with your actual Atk stat, or sub wep, etc it depends,
Twin Slash and Phantom Slash derive their dmg from your Atk stat (need to double check on this), Charging and Spin not sure. Some of the DW guides have more information on how the skills are calculated.

My knowledge isn't 100% correct, so take what I said with somewhat a grain of salt. Hope I helped ya~ ^^" or if I confused you my bad

 

Phantom slash cause it adds up xp