If you're new or returnee like me. With 6000 orb, you can get SR weapon brick to MLB all four servant shark. And feed all pluses into them.
I say 40% assault/defender on all element is worth it in the long run.
In the long run, all of those will be replaced by far, far better weapons.
Unless you'll run a Rainbow team, which brings a whole host of other problems and isn't recommendable.