flame throw is great to kill anything in your way so you don't have to deal with swarms

auto cannon
perks: enough ammo to use for the whole mission
easy heavy kills
chargers are 3 shot in the weak spot with this
and hulks are maybe 2-4 shots
great for all situations
good crowd control
good heavy armor killers
fast firing
fast reloading compared to other 3rd weapons

quasar cannon is great for taking out heavy armor and no refills needed just time to recharge
bad for close quarters but great long range

spear is great long range but medium to short it can barley fire
is great but with only 4 shots it can only kill 3 heavy's or 1 very heavy

laser cannon ( i think is the name) is great to kills bugs taking little time to take out weak swarms

auto cannon is good for the crowds and the medium armored units
(medaaaaa)