>>718409540
The tank. Because the tank can actually maneuver on a battlefield and can take part in decisive operations where the enemy is actually defeated, potentially bringing an end to the war and gaining you victory. It's also nowhere near as vulnerable to countermeasures as the cheap drone is.
All the drones do is let you fight a failed attritional war like the one going on in Ukraine. Is that really what you want? To turn a three-day-operation into years of failure and a million dead with no strategic objectives achieved?

Actual worthwhile militaries have the resources to take BOTH the drones AND the tanks. Having to choose between the two is something irregular forces or third world countries are subjected to, while genuine militaries vie for full spectrum dominance.