Turbolaser cannon makes explosions, but they’re so big they tend to damage the vehicle they’re attached to, and any loot on the thing they shot. Plus if they shoot near you they’ll hurt you, so unless you want to keep one on manual fire for hordes, don’t bother.
V9 laser pistols are the most efficient in terms of energy to damage, A7 laser rifles are a step above in terms of DPS and range, laser cannons are the most damaging, so they deal with armor better, but they also have the lowest efficiency.
If you can manage it an array of V9/A7s will tear apart anything that comes near you.