This is a loaded question. There is no right answer. If you are doing something that has a burn (arc, solar) then the answer changes.
I can tell you that you shouldn't be trying to limit your primary slot to Zalo Supercell. (This one guy I knew just kept Hawkmoon in his primary slot just because it was an exotic he thought it was the best option. He kept trying to shoot stuff across the map). God I can't even imagine what a nightmare trying to play like that would be. Just use Zalo for arc burn activities and get yourself a decent scout rifle or pulse rifle (legendary) for routine stuff. Use Gally as your defacto heavy as it will work in 99% of situations, and grab a decent high impact snipe from a vendor, like Event Horizon.
If you have to have an answer, just get these and you can manage basically any situation:
Primary - Hand of Judgemant/ Fatebringer
Secondary - Icebreaker / Ex Machina / Found Verdict
Heavy - Gjallarhorn / Sleeper Simulant / Raze Lighter
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Thanks for the reply! I have Iron Gjallarhorn, if I infuse it to get it stronger it should be good enough I suppose. Hand of Judgement and Fatebringer both seem to be hard to get, but i'll try my best.