You should have made the question a little tuffer and left the big one out of the picture. In that scenario I would not shoot the doe or the smaller buck. However, whether or not I would shoot the buck standing there wtih the doe would also depend on the day of the hunt I am on. If it's the first day of the hunt then I am not shooting even if the big buck isn't around. I am waiting on a bigger deer. If it's the last day of the hunt then I am waiting for the doe to step clear and smokin him.