Well, since you are just starting?
Sword & Sword / G.Sword / Staff.
G.Sword is offensive ranged, that deals crippled condition out with its Phantasmal Berserker (AoE at that). Mirror Blade gives you a good burst of damage at close range (Multiple stacks of Vulnerability on Enemy and Might for self). Illusionary Wave is great for getting distance while kiting. And its auto-attack deals rather nice damage at long range.
Staff is focuses more on Defense, but its still a good offensive weapon as well. Its Clones are the only ones that actually DO damage (Through conditions) without a trait post-level-40. Chaos Storm may look like a great AoE to place on enemies, but this is wrong. Its a GREAT AoE to place on YOURSELF when enemies come into melee range, as it will give you multiple procs of Aegis as you stand in it, while tearing into the enemy as well. Chaos Armor is helpful after Chaos Storm for survival if you can’t kite. Its Auto-attack BUFFS you and places Conditions on the enemy, which your Clones will also do, when you are in melee range with the Staff. Its great at either Melee or Ranged distances.
Sword & Sword? This one only if you are melee-centric. Its rough as you can not stand there and take the punishment. You have to do hit & run approaches, using Leap -> Swap to get in close (timing it right will get you behind an immobilized enemy, so they can’t attack you for a few free auto-attack hits), followed by Blurred Frenzy for damage (which makes you invulnerable during the durations as well), then backing off until CDs are cleared again. If the enemy is attacking you and your heal skill is on CD, don’t be afraid to kite for survival or swap to your ranged weapon. Off-hand Sword is great as well, giving you a Parry/Block skill to absorb a hit, forming a clone, AND a high damaging Phantasm that usually survives better then the rest.
Tack on the fact that Blade Training (20% off Sword Skills and 50 Precision) is the ONLY weapon trait available pre-40, that makes Sword & Sword rather tempting early on. Especially when combined with Illusionists Celerity (5 Illusions for 20% off CD of Illusion Skills), meaning all Sword skills are 20% off CD(8 second Blurred Frenzy) while its Illusion skills like Leap and the Phantasm are 40% off CD.
Post-40? Things open up even further, especially for the off-hand. Definitely have one of each weapon available after that level, if you don’t have them earlier.
tht helps thanks all