To recap:
Aphelion/Eclipse/Zenith for shields.
AR-50/C-44-P-15 for armour.
Executioner + Tormentor is my go to. In a Maverick.
To put things in perspective from my experience,
4 G5 Executioner/Tormentor hits will take down the toughest targets usually.
With a G5 Aphelion or AR-50 you end up pumping lots of rounds at the target for the desired effect and really do burn through ammo. As well as having to be around and not shot at by other enemies to achieve a kill.
With a double L-6 loadout, once again you burn through ammo.
For intense Aphelion/AR-50/L-6 usage, extra ammo capacity on a suit should be considered.
A weapon not considered already, is a map of the environment you are fighting in, so you know where the recharge points/packs, ammo crates and medkits are located. Sometimes, doors will be locked, so using a Maverick could be a bonus. Oh, and some buildings have one door open and another locked.