Mechs Plate, Hold, Quadro, Triangle and Tentacle are all bit weird as Plate is clearly best of them early game as you need the motors and aux slots, Hold is decent and has some underwater bonuses, while Tentacle and Quadro seem like upgrade once you have nice motors and reactors, but Triangle is always bad choise...

Even the starter mech wins Triangle in speed, reload and fire time but 4 weapons are naturally big bonus for Triangle, but it loses out on motors+aux slots for Plate. I never figured a time in game where the Triangle would have had its use.

I recommend giving Triangle 6 motors so it could out gun Plate early game, even if it loses on aux slots, hp and reload times compared to Plate, it would at least get 1 extra gun making it worth using before you can gear Quadro and Tentacle.

Tentacle also seems problematic because of the motor limitation, only its underwater performance might make it worth using over Quadro but I havent had time to test them that much.

But for now Triangle is useless mech :(