For my Freagle, 1 Gimballed Burst on top and 2 Cannons under the wings are just fine. For such a small craft that combo delivers quite a punch, and asks for some piloting skill to hit with the slower shells which is exactly what I want. And if they do, they mess up Subsystems nicely. Currently doing RES farming with that to buy my Vulture a FSD that can take her out of her home system
Main downside is the low amount of ammo.
For the Cobra that I used to farm to get funding for my Vulture, I was VERY pleased with 2 G1 Pulse and 2 G2 MCs. Unshielded targets of any size get chewed away like nothing.
Now, for my Vulture, I try the famous 2 G3 Pulse loadout. Would love to try something big like Rails or Plasma but I fear that then I would have to shut down everything from drives to life support to get enough energy ...