The male may grow another foot or so depending on his age. My mainland males are all 12-14 feet. The female your friend has likely won't get a lot bigger.
Something else to consider is that a placid large female will be safer to work with than a male half her size that is willing to go through you because he's got lust on his mind. The former can hurt you but it's not likely unless you screw up while feeding her or do something really stupid, while the latter will put you in the ER if you don't read him right.
For a pet retic I would get a high percentage SD female over a male any day.










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