Cyborgs vs Robots
Let's imagine I have necessities to expand warfare into one of these two possible fields out of lack for different/previous options.
Build big war machines which are completely robotic, or breed kaiju-like big beasts using CRISPR (genetic editing) and then implement them through technology, turning them into cyborgs (even just to make them substain their own weight). An important note, such cyborgs would not be able to self reproduce (so they lack the fire&forget philosophy about bombing a planet with a couple of Xenomorphs Queen and let them overrun all other life forms).
They would be living beings with implemented muscles, skeletons, and weapons. On the other hand there are robots, fully machine. Same weapons, but no internal organs, biologic muscles nor veins.
I would like to know which would be the better option.
At first I supposed it would be the cyborgs because they can self-feed through preys (enemies) but I quickly realize that robots could be structured so to ingest&melt fallen enemies in order to harvest calories and minerals/metals.
So I switched to robots. 64
Subsequently, I realized that robots can be hacked and you do not want for your billions-costed walking nuke to fall in the hands of the enemies. Plus I suppose robots would anyway need more energy than cyborgs in order to work.
So my curiosity switched back to cyborgs. I also realized that only an extremely advanced AI can work as efficiently as the instinct from a predator DNA would.
And yet I reflected about the fact that cyborgs are easier to hurt I suppose (but a good armour would maybe do the work) and being living creature they would feel fear (pain can be shut down through meds).
I would really love to hear from you, ranging from short&clever reflections to long mathematical computations about energy spent for the robots and/or economical costs (in this case feel free to include detailed maths about them for I have a bit of a background in those subjects).
An additional question is about how much of a cyborg would it be fitting to be cybernetic (weapons excluded). Bones must surely be implemented with metallic nanoparticles and an external armour is mandatory, but would it be better when it comes to cost/expense ratio of both economical resources and energy, to replace all organs with machines, or even create a robot and then just put a living brain in it so to avoid hacking? Or on the contrary, a fully living being with just a metallic skeleton/skin/fangs/teeth (and missile-launchers on its back but here we are speaking of a different matter)? 64