Fender vs Corruptor
Generally speaking...
If you're using fire blast, ice blast, or kinetics, roll corruptor. Otherwise, do defender.
Between the two you're looking at there, I'd suggest the corruptor. You'll still be able to soft cap yourself, and your rain of fire will be much more powerful.
Rain won't be that big of a factor against AVs. Scourge, however, will.
With the exception of sonic/sonic, nearly all of the time a corruptor will out-damage a defender; particularly true against a hard target when Scourge is taken into account.
I have not looked at the numbers on both ATs for a long time. But roughly speaking, a corruptor does about 1/4 to 1/3 less buff and debuff than a defender. It might seems a lot on certain buildings. But with the combination of (carefully planned) stacking effects and higher base damage, corruptor should still come out ahead in terms of damage output.
That said, if you see damage output as a collective effort of a team, then a defender offers a better deal simply because it is a better force multipler.
I wouldnt mind a Fire/Traps // Traps/Fire
The obvious choice is to go for a corruptor but with the 30% dmg buff for solo fenders and fire being ported over, is it worth waiting?
With identical builds which will solo AVs etc quicker?
Thanks for help guys
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