Actually I think Bull Sharks attack more people......but what do I know.
Bull sharks frequent shallow waters where people congregate so human interaction is much more common. They are also known to enter brackish or even freshwater and have been known to go hundreds of miles upriver. Back in the 1920s or 30s one was caught in the Mississippi outside of Cairo, Illinois. Tigers are known man eaters but tend to stay in deeper water. IIRC, tigers figured prominently in the USS Indianapolis attacks.