When choosing a chainsaw for tree removal, consider the power source, bar length, weight, and safety features. Gas-powered chainsaws offer more power and are suitable for large trees, while electric and battery-powered chainsaws are lighter and better for smaller jobs. The bar length determines the size of the tree you can cut, with 16 to 20 inches being sufficient for most tasks. It's important to select a chainsaw that you can handle comfortably for extended periods. Additionally, look for chainsaws with safety features such as anti-vibration handles, chain brakes, and easy-to-reach controls to ensure safe operation.