The answer to 'which is better aeration or' is that aeration is generally better than overseeding for improving the health and appearance of your lawn. Aeration involves punching small holes in the soil to allow air, water, and nutrients to better penetrate the roots, while overseeding simply adds more grass seed to the existing lawn.
Aeration provides several key benefits over overseeding, including improved drainage, reduced soil compaction, and better absorption of water and fertilizers. This results in thicker, greener grass that is more drought-resistant and less prone to weeds and disease. Aeration is also less labor-intensive than overseeding, as it can be done quickly with a specialized aerator tool.