I feel Displayport is a lot better than HDMI for a few reasons.

First is simply that there is a clip to hold DP in place. Why they thought HDMI would be fine without one is beyond me.

Secondly DP has a much higher bandwidth. I run a 2k 144hz monitor and it will not even accept HDMI as it would not be able to carry the signal.

Third, you can daisy chain monitors with it. Meaning multiple displays from a single output.

Because of these I feel like it's the next step in the evolution. Akin to moving from serial cables to usb.