What sex should my my second cockatiel be

​​​​​​​ what gender should my other cockatiel be. My male cockatiel is pretty friendly he is just does not a hand fan ​​ but love sitting on your shoulder or being around you same with other animals

I'm wondering if I should get the male aor female ​​​​. I know the personality is different but I don't mind I just want to know if it would be better to get a female versus male or vice versa ​​​