What class makes the most difference in Crystal Conflict?

Been stuck at Gold forever now.

My Win/Loss ration seems to be exactly 50/50.
I play warrior and nearly top Damage-Dealt, top Healing and top Damage-Taken every lost game.
I place markers, shout what target I'm after and always keep + on the healer.
It is getting to the point where I know a which team will win a few seconds into the match.

So anyway, I was looking for the class that creates the most impact on the win ratio and looking at the Ladder I see many Dragoons up there but I was thinking of Ninja to try and quickly kill the enemy healer. I am also willing but rather not play the healer, yet again, if that's the difference between win or a loss then so be it.

What class do you play and how much difference do you make?

Edit (Class=Job)

I play a lot of Paladin, Monk and Bard, I've hit Diamond after switching out from Ninja and Dragoon in Platinum.

My tactic is pretty simple, harass the damage dealers. Don't let them have any room to breathe, if I see an enemy Dragoon, Machinist, Ninja and so on, locking them down is my priority since they'll be the ones deciding if we win or lose since they have the means to kill my teammates pretty quickly which means less people standing on the point.

Paladin is great for harassing and locking people down, it has a lot of self-sustain and a reliable dash + stun combo, it's limit break can also turn the tide in a teamfight, making you invulnerable and halving the damage your teammates take. You also function as a mini-Hallowed Ground for a teammate if you use Guardian/Cover correctly and combine it with Guard to reduce the damage you'll take in the stead of your teammate.

Monk is heavy on crowd control and it's limit break disables Guard and stuns, probably needs some tuning so it doesn't take as long to build up like the other classes rotation wise, but it's a tank/dps hybrid, it's great when you're in a stun-heavy lineup.

Bard is great if you pick out priority targets to silence them and harass them, it also heavily promotes being at maximum range to deal the most damage with it's kit, plus it's limit break allows you to help others build up their limit break faster but the only issue is, if you're a Bard on a low damage team, then you're a bit screwed even if it a great support DPS.

Pretty helpful, thanks for the info.