solarz
Brigadier
Per shot, lasers should be cheaper. It should be more accurate: no windage and PTS can lock quite well. Lasers above 100k can be used against more than UAVs (155mm artillery shells have been toasted, frex)
That's a discussion for another thread.
Ammo for laser is electricity, which in this case would be fuel for the onboard generator. Your logistic train would already have to handle fuel so it fits right in. Fuel trucks can easily deliver the fuel and pump it into the fuel tank of this vehicle. If it used an autocannon than resupplying it would be more complicated.
Using electricity also has some interesting applications for the future: if in the future charge stations for electric cars become so common that every street lamp post have them you may be able to miniaturise the system even further or stretch out the onboard fuel for longer by plugging in whenever possible.
But if we're talking about portable drones for recon, using truck-sized countermeasures seem very unwieldy.