My choice varies. If ads for the game emphasized one gender, I often go with that. That was true for Immortals: Fenyx Rising, which emphasized the female version in ads, so I choose female. And green skin. Or in Dragon Quest Builders II, which also emphasized the female version in ads. In many games I try multiple characters, like Skyrim, then I have both genders present. In some games I choose for the better looking variant, especially if one is looking like shit. it also can because I somehow connect one gender to the gameplay. Or subverting this, so for cozy or farming games I often play the male version, for violent ones often the female. So yeah, it varies wildly.