For open world I'm using nothing but duals swords, just feels to good. You have good range, good enough damage at range with some cleave and a mobility skill, with a fear on 5 that you can proc quickness outside of shroud with the grandmaster trait.
I run support scourge in WvW and it does baffle me a tad that they hit scourge and not firebrand at all, when firebrand is essentially mandatory in every WvW group not so much scourge lol