I currently do both run/jog and bike. I looked at a chart for calories burned. There could be an arguement for the number of calories burned per hour, but I used the same chart that had biking and running at different speeds and weights. Amazingly for me at the speed I normally ride my bike and run at I burn about the same number of calories per hour. But, I can ride for several hours where a hour run is my limit for now. I tend to run more in the winter because there is less wind chill and I can more easily get out of the way of cars on icy roads.
Even through the summer I like to run some so I have the ability to do fun runs if I want. Why work hard for fitness and not be able to do an activity such as that if one wishes.