Is walking or running better for fat loss?
This is always a difficult question to field, as there's a lot of debate around the subject. It bears working through.
Lets assume that there are two main ways to do cardio work for fat-loss. The first is very light exercise, where the heart rate beats at around 105-120 beats per minute and there is little or no barrier to recovery. The second is highly intensive training, where your heart rate is pushed up close to its max, which functions to stimulate your metabolism and burn excess fuel. Light exercise benefits from operating within the ‘fat burning zone’, meaning that proportionately you burn more calories from fat (though less calories overall) in comparison to other forms of exercise. A second benefit is that you can basically do as much of it as you like, as you don't need time to recover from your exertions. Highly intensive training however, stimulates your metabolism to burn fat far quicker, but must be respected and given adequate recovery time.
My answer to the question is that walking and sprinting are both excellent ways to burn fat. Leave the jogging for running events, not fat loss.