With fewer parts and a much simpler mechanism, ball heads are usually preferred by more advanced photographers. They are usually quite expensive  most professional-quality heads are more than US$200, although some heads are available for less than $100.
Ball heads are simpler in design and construction, making them preferred by more experienced photographers. They are typically quite costly, with most professional-grade heads costing over US$200, although some models can be found for less than $100.