It is beneficial to both sides, but it is only a matter of effect. Generally speaking, brisk walking is beneficial to increase heart rate and blood circulation, which leads to an increase in metabolism and weight loss to some extent. Fitness generally takes a long time (walking 6 kilometers a day, I think it is recommended not to walk so much every day if you are unwell), and jogging is more suitable for weight loss and fitness. If you think it hurts your knee too much, you can slowly adapt to jogging. (At first it was just a sprint, etc. And then adapted to the prescribed sprint and then went up. Jogging not only enhances the heart rate a lot, but also achieves a certain fitness and weight loss effect after a period of time, but in the end only you choose the one that suits you (I hope you can adopt it).