I can subscribe to the idea that Sidearm can be better than 20% Maniac on single target, before the actual line AOE comes into play.
But the reason I'm hesitant to switch to Sidearm is because of EQ. 20% extra EQ damage is pretty nice, especially considering that I use EQ on every single boss pack, no exceptions.
But, in the end, is it worth it? How big is the gap between single target Sidearm and Maniac? Is it worth giving it up even knowing that EQ is going to be 20% weaker?