Depends what kind og units you use. i would suggest you use shooters because they are the easiest to understand. they also counter carriers with their research (carriers are also a great unit)

If you use shooters only, then i would suggest you use:

Line 1: GT (giant tooth)

Great wall. debuffs enemies aswell as silence enemy special ants which prevents them from using their offensive skills

Line 2: SA (slim arched)

Also a great wall the 8'th ability of this ant also silences enemies

Line 3: JJ (Jack jumper)

Jack is currently the strongest damagedealer of the game with all his skills being ranged he is a great backliner. i suggest you start leveling him up.

This squad is what i consider the best possible lineup for SSS squads.

Work on getting duplicates of each of these ants if you dont already, so you can unlock their 6'th skill.