i have a few tricks when trying to decide what to buy. first i look at price, buy the cheaper gene you want as a female. reason being you can raise the female for 3 years before she can breed. so in 2 years the male with the better genes will be cheaper and needs less time to be breed able.
also its better to buy the female first in order to raise her, regardless of genes.
otherwise it doesnt matter male or female. its up to you and what you want. if your looking for just a pet then consider size. males stay smaller than females.
adam jeffery