Why not both?

Let's also stick an extra USB-C port on the side of the phone so that you can charge from whichever port is more convenient at the time. Or use an accessory like wired headphones and charge at the same time without carrying around a USB hub. Or if one breaks (charging ports are one of the most common things to fail on the phone) you can continue using the other one (either temporarily until the other is repaired or indefinitely).