my favorite is br or dmr
magnum
frag
promethean vision
aa effiency
dextarity
promethean vision and aa effiency go well together because after a short use of pro vision it recharges while you get the kill
I have a preference for covie weapons, so i find more useful al all.covie loadout.
Covenant Carbine
Plasma Pistol
Plasma Granade
Active Camo
Mobility
Sensor
It is very usefull all-around loadout, and deadly on BTB, for both infiltration, Recon or vehicle destruction.