Ball heads are great for small and medium format, mainly because speed is usually more crucial when shooting with these cameras. They are also more compact and much easier to tote around than a 3 axis pan/tilt head. For large format work, then the 3 axis pan/tilt head is preferrable. But don't get a cheap head of either type. Bogen/Manfrotto make stuff with the best bang for the buck. The tripods are heavier than the big bucks carbon fiber jobs, but they are stable and sturdy. Their ball heads are not a slick as the Arca Swiss models, but they are plenty good enough and are 1/3 the cost. If I could justify it, I'd use the Arca Swiss ballheads. But I can't, so I use and can recommend the Bogen/Manfrotto units.