Here’s a list of primary weapons I consider to be top tier against the Cyborgs:
SG-225 Breaker: this pretty much annihilates the borgs and takes care of everything expect warlords and IFVs. Very effective at clearing low to medium level enemies quickly. The downside is the high teamkill potential.
RX-1 Railgun: will make life easy not only for himself but the team too. You can control the battlefield with this, IFVs are the only thing the Railgun can’t handle. While it may not kill units as fast as the Breaker, it is even faster at stopping them. Stun is insanely strong. The downside is you need to be both accurate and fast.
AR-14D Paragon: true steamroller, this thing has accuracy, DPS and fire rate all in one package. Slow poison is extremely good and makes life easy for you and your team. You can use it as a support weapon or as an offensive assault weapon or both. The downside is you need to be able to manage the ammo consumption.
PLAS-1 Scorcher: this makes you wonder where all the borg units you were shooting at suddenly disappeared. The Scorcher packs a lot of power and clears everything below warlords really fast. The downside is you can set yourself on fire if not used carefully.
Many of the other weapons are very useful and effective too, I’m just covering a few of them I consider the strongest. Generally I feel weapon attributes like stun, slow poison, mini stun etc. are underrated. If you can use them correctly, they will to truly shine.
There’s a lot of stratagems that deal with heavy borg units with extreme effectiveness: Commando, EAT-17, Vindicator, Rumbler, Demolisher, Railcannon Strike, Close Air Support, Heavy Airstrike etc. I’m not even mentioning area denial as I don’t like them, you can make the game boring with them.
Build a loadout so it’s able to take care of every unit. For example if you take the Railgun, the Commando compliments it as it takes IFVs out like no other. Add something else for the other enemies, for examples Vindicators or CAS, HSR or SR. Use stun to take advantage of those stratagems.
If the borgs feel too challenging, there’s already a solution to it. Drop down difficulty and try again. Go back up when you feel you’re ready for it.