brain is state of the art biology tool and under permanent improve-evolution (both at creation and during living). computers evolve much much much slower. until they achieve the same ultra fast evolution-reproduction they cant compete. even so called "immortal machines" utopia are overhyped, they would need to harvest energy. thats already what the living bio organisms do, harvesting energy the most efficiently as possible. if immortal was efficient nature-wise, we would already be.
Caption this Meme 