Both treadmill walking and outdoor walking have their own set of benefits. If you value convenience, consistency, and the ability to control your workout environment, treadmill walking might be more suitable. If you enjoy the mental and physical benefits of being outdoors, or if you seek variety and natural challenges in your workout, walking outside could be more beneficial. If you walking a part of your routine you will need a treadmill for times when outside exercises isn't possible due to weather conditions or time constraints. .