The whole "display port seems better for me" is interesting. It seems people prefer a specific port for some reason I've seen people complain about DP/HDMI/DVI causing eye strain while others being fine.
I don't think I've seen a difference for me. I've never used DP but HDMI and DVI seem pretty much equivelant of each other on a "comfy" GPU but I would imagine it's definitely possible for one to be better than the other either for you or just for an individual card.
I guess this means we should always try all ports before assuming a GPU is "bad" for us?
Generally my connection now goes GPU > DVI to HDMI converter > 10m HDMI cable >HDMI to DVI CONVERTER to monitor so I'm really using DVI at this point. This seems to be fine for me with "good" GPUs
(10m cable because I like my computer in a different room for maximum silence and I use an HDMI cable because of the smaller connector making the hole much smaller. If you want a silent computer this is the way to do it. Nothing is loud when it's completely out of earshot)