SL's want Dex and Vit/Agi in PVP unless you're like me and stand in the center linking random people till you're killed for not helping someone. Vit is probably preferable to those using a Dagger of Counter.
Someone in a PVP server should fix SL techniques to work on other players just nerfed.
WoE depends on whether or not you're going to be support. Taii on Ymir RO had an awesome SL guide but the forums are down so cant show.