The rules are very simple. As a default, just stick with condoms. If you want to bareback, use PreP. It's not rocket science.
Personally, I'm in the condom only crowd. I've read a number of studies about PreP causing bone loss and kidney/liver issues. I don't want to have a shitty older age and so why would I open the door to those issues? I just stick with condoms and call it a day.