Helldivers 2

Explosive detonation or something gives the grenade pistol that allows you to use utility grenade without sacrificing your ability to close bug holes or destroy fabricators. The weapons also have this ability. So this warbond will open more builds than any other warbond.

Cutting edge is right behind, or even arguably on par. Because it has the stun grenade, and excellent weapons. But the stun grenade is a game changer, trivializing hulks and chargers. It's almost cheating.

Steel veteran goes after them, but it also has amazing weapons. But it's a matter of preference after the first two. You can't go wrong with this one while the other warbond are more hit and miss.