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A lot really does depend on the individual ham, some males can be calmer even a bit lazy so easier to handle but you could just as easily end up with a crazy one who loves to run around & not sit still & there's no real way to tell when they are very young quite how their character will develop.
When looking at young hams you just need to look for general signs of good health there aren't any gender specific health problems you're likely to see but as they get older with females there is the potential for pyometra not something you have to worry about with males.