I think it was Jack on Roster Teeth that said it best...
Everyone made their online character for GTAOnline as basically themselves, except Jack, he made a female character. They all start ripping on him and he hits them with "if I'm gonna be staring at an ass for the next 500 hours, i want it to be a girl's ass." I think Gavin even asked if it was too late to switch.
ETA: girls run faster in GTA, so it's the better choice by any metric.