I see everyone running different weapons, (some on the same ship). What is the best for doing elite borg STF with an escort?
Matching energy types, Dual Heavy Cannons and Turrets.
As to specific energy TYPES???
avoid Tetryon, only use Polaron if you have the Jem'Hadar 3 Piece, and Disruptors tend to be 'crunchier' in pve situations than Phasers thanks to the difference in procs...oh, of course, there's Antiproton, which is quite nice as well.
"when you're out of Birds of Prey, you're out of ships."
Look into Vanilla PvP if you're tired of the endless pursuit of grind, utterly unbalanced selections of geardo-inspired traits, and generally unbalanced and careless 'development' made mostly to turn this game into a second job.