So many non-answers that are like “war janck pls”

That’s not what the question is.

I don't really care because I rotate my screen 180 degrees in landscape if it's on the bottom and I'm using headphones

side

The side of the phone.

Top. So it can sit in my cup holder with the map up proper.

Honestly it doesn't really matter to me. Depending on whether it's on the top or bottom I'll just put my phone in my pocket to make it point upward when I use it. I tend to use Bluetooth anyway most of the time, so the headphone jack is mostly there as backup and for connecting other audio devices at parties etc.

Top

My phone has it in the upper top right, and I like it there.

I don't think I've seen one at the top..

I'd say bottom because I'd rather not have the cord coming towards me, rather than away, when I'm using the phone. Also it seems more ergonomic for me to put my phone in my pocket with the top pointed down rather than up.