Criteria for choosing male or female of a certain strain for breeding

Genuinely interested.
As the title suggests, say I have stain A and B and decided to breed them.
What are the criteria for choosing the male/female of strain A?
What is it that determines the choice of sex of a strain to be bred with the opposite of the other strain.
If I liked a strain, what makes me choose the female over the male for breeding?

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