internal PSUs
>often proprietary form factors, component failures often mean throwing device away, screechy internal fan
external power brick
>interchangable, just buy a new brick with same voltage and enough amps, solder the old plug on if you can't get a new one to fit, super cheap from mass production while still being standards compliant and reliable, fanless and silent

face it, external bricks are superior
>but it looks ugly
stop being a woman. You can also hide them under your desk or whatever and benefit from a smaller and quieter device. Get a GaN one if you want better portability.