The Slosher is one of my best weapons, but the Tri-Slosher quickly became my best weapon, no doubt.
While the range on the regular Slosher is useful, I find the speed of the Tri-Slosher more useful than it (regular feels so very slow now...), and I find myself winning firefights more often with the Tri.
I'm not exactly sure what makes the Tri-Slosher my best, I figured it was the melee capability combined with the Bubbler, but as I examined my play, I don't even use the Bubbler all that much, and I still do better with this than any other weapon. I suppose it's the reduced need of precise aim (I'm not very good at aiming quickly) and being able to kill flanking or backstabbing enemies with a turn-around attack fairly easily. In short, I'm sortof a flail fighter... though I still go after people directly and win direct confrontations, even with long range weapons.
Overall, I guess it's just the right balance for me of range and kill potential.
The weird thing is that I don't use the Disruptors. A lot of wasted potential there, for sure...