There are many reasons to visit Shimla, but there are also several differences between the two cities. For one, Shimla is more popular with tourists. During the summer, there are plenty of activities to try, including hiking and paragliding. In the winter, there are activities such as skiing, ice skating, and heli skiing. There are also a number of other attractions, including Zorbing, an inflatable ball sport. If you're looking for some adventure, you should visit Manali in December.