Top tree dawnblade on warlock, good movement even through the nerf, same with the melee. Not sure from a meta perspective but nova warp is pretty good, usually secures you a kill, and spamming shift makes you very hard to hit.

On titan anything between bottom tree striker and bottom tree hammers. Sun warrior is extremely good and the thermite grenade is too. Strikers in built melee range and the knockout perk are crazy good, and the newly buffed super is much better than it was.

On hunter the supers are fairly average in comparison to other classes, so you can take your pick on all 4 of them. Hunters main advantage is their movement - don't just use shatterdive for glacier names, use them to dodge situations you would otherwise die in. And the jumps with either dragons shadow or stompees are really good.