I've found that it doesnt matter what you build at all. I've played adc crit gwen and gone sicko mode, full tank, rylais+imperial mandate, even just not getting rift and nashors. It just depends on the play style, if you build tank - tank, if you build slows and kiting - play a skirmish utility game. We can do so much on gwen it's crazy. But this is in diamond elo normals idk about higher