Swords for Onslaught, using Double Axe / Bladed Staff. Or if for some reason you need 1 handed Whirlwind Swords is the only choice with the Radiant Scimitar.
Mace for Maul / Hammer Pick. Or Black Staff's for 2 handed Whirlwind.
Fencing for Leafblade Feint / AI.
Swords gives the most damage because of Onslaught. Mace is an alternate choice to Swords where the main difference is the one or two handed weapons are pretty much opposites, so if you're a regular pot user and don't want to unequip or use the Balanced it's a good choice or if you're building for specific encounters, Mace is also better than Swords on some very specific builds such as Mystic hybrids or builds/encounters with swing penalties. Fencing is easier to Stam than the other two, but I consider it the 'my first dexxer' option it's already pretty hard to die on most dexxers Feint makes it pretty much impossible to die but at the cost of damage. There may also be something to look into with a Necro/Fencer build combining Strangle (damage increases with targets fatigue) with Pierce (reduces targets Stam), you could possibly combine that with Hit Fatigue / Hit Mana Drain and theoretically turn opponents into sitting ducks.