Do not underestimate a Gunships power, it is essentially a capital ship gun platform with weakened armor and shields. The Sector Support ship is essentially a super scout, with an extreme range of radar and high speed profile. It also comes with a Large Nanite Repair Gun, which is great for repairing other cap ships during a battle. Destroyer A fighter Killer. LRM Hunter Killer missiles are effective upto 1400m away.
Frigates are essentially tougher versions of the Bomber, best used in the attack of Starbases.
They can provide a significant challenge for a number of small ships due to excellent coverage from turret guns. Its size however makes it a big target. The Missile Frigate is the base killer of the bunch with a variety of missiles to use. From SRM Tactical Nukes to XRM Cruise Missiles, it's there to destroy bases from a variety of ranges. Finally the Cruiser, which is the multi-role cap ship.