I've been really digging crossbow lately, it's insane how good it is on both fronts. It's especially good when there's a spewer map, because it can kill 2-3 of them per mag now.
I like to run antichaff, because people tend to ignore it on the bug front in favor of primary weapons.
Crossbow, Stim gun (unless theres two shields on the team), Gas grenades (or thermite if we need more AT)
For strats I usually take regular machine gun, supply pack, 500kg (for occasional base clear/bile titan), and gas strike.