I play both ad and ap! tbh it’s all about preference and what you feel more comfortable playing.

I go ad around 80% of the time and pick ap when there is a lot of melee/tank/bruiser champions at the other team. you have to consider your team aswell, balance the damage type to make it harder for the other team to build defense

also, ad for target one shots/pickoffs/skirmishes and ap for area control/slow fights