Cardio isn't used to build muscle, so the apparatus really doesn't matter. What your heart rate and effort level are at is more important. The only difference some people would say is that biking only uses your lower body, whereas running uses your entire body therefore running is better.
According to my exercise physiology texts - biking at a moderate pace has the same calorie burning effect as jogging at a 12 minute mile.
It's a good idea to switch types of machines often anyway just for variety and to give your body something different and take strain off of your joints.



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