The Ego Power CS1804S is a more powerful and durable chainsaw, but it's also heavier and more expensive. The Greenworks GCS80420 is a more affordable and lightweight option, but it has a less powerful motor and shorter battery life. According to a review by CNET, the Ego Power CS1804S has a cutting speed of 6500 RPM, while the Greenworks GCS80420 has a cutting speed of 6300 RPM (per CNET).