Favorite Parts(Gameplay Wise)

What the title says; what's your favorite parts, if not aesthetically, for gameplay itself?

Besides the obvious Strike Freedom Backpack, I've found Destiny Arms with their built in Option Equipment "Palma Fiocina" invaluable for Newtype Difficulty. It's like having shining/burning finger on instant cooldown, with lightning element stun built in.

Currently I can one shot some of the weaker mook suits on the higher difficulties, and the lunge that comes with it makes my suit difficult for the AI to track. Plus it comes with two beam boomerangs also, so that's nice.