The best way to make that choice is to calculate:
The weight of the heaviest lens to be used + weight of heaviest camera to be used + weight of tomahawk
Using this number as your ball head "load", check out the load capacities of the ball heads available from various manufacturers.
The more the load capacity of the ball head exceeds the total equipment weight, the more stability and reliability you will have. (This presupposes that the load capacity of your tripod similarly exceeds the applied load by a suitable margin.)
For a number of years I have used Markins ball heads (M20/Q20 Series). These heads have a rated capacity of around 50kgs and only weigh about 500 grams. The performance of these ball heads is superb when supporting the load of a 600mm f4 and a Nikon D4, for example. There aren't many heads that have this kind of capacity.
The Wimberley website provides a basic comparison chart for a number of ball heads. This is a good start for a selection decision.
Hope this information is useful.
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Answer provided by: Ford Kristo Foto (6/13/2014)