DisplayPort is superior anyway.

Why?

I’ve never understood the difference other than I get the vague sense display port is associated with apple.

Me neither. I play at 1440p/120hz. Both cables can manage that resolution and frame rate.

The only difference I get is when I use DisplayPort and leave my computer alone for 20 mins, the GPU goes to sleep and the monitor won’t display anything although I hear background apps/games running.

Without changing any settings, using a HDMI cable solved that.

HDMI it is.

In a multi monitor set up, when a screen connected to display port goes to sleep my computer treats it like that screen was disconnected - meaning all my open applications get shoved from one screen to another. I’ve also used HDMI to avoid that.