D/D is out of the question exept for bossfights if you are confidendt enough to go in melee, i use S/D because it gives big CC possibilites if you combine cloak and dagger with sword number 1 and it slashes more than 1 foe at a time. In off hand i use SB because of the mobility it gives and AoE damage it can produce.
My build, 10/30/30/0/0 is the same for PvE, sPvP and WvW 10 in deadly arts is mostly for mug, i adore mug because it can be a real lifesaver sometimes (breaks stun and teleports) and it can burst quite a bit of damage, 30 critical strikes is for dps, and 30 in shadow arts gives quite a bit of armor and big regeneration. If you combine shadow refuge with shadow embrace and shadow rejuvination from big slots in shadow arts trait line you can be fully healed and battle ready in less then 10 seconds. Many players say that is better to make 0/30/30/10/0 version of this build for a bit more HP, but i got adiccted to mug
I use fully berserker armor set with superior rune of the eagle, sigil of accuracy on all weapons, and full valkyre jewlery (back slot is berserker), this gear gives me 14k of HP, crit chance 53% and crit damage 100% wich is quite nice concidering that with shadow arts i never engage with less then 4 stacks of might.
I also eat “bowl of curry butternut squash soup” for extra 100 precision and 10% crit damage if i make it.
my utility skills are shadowstep, shadow refuge and assasin signet, i like using thiefs for elite skill but some situations require daggerstorm. Shadow refuge is great for dungeons in case u need to get som1 raised quickly or you need a quick cover.