The truth of the matter is, if you have the money to spend on hardware that can push details across large panels, then there is no debate to be had. It's also based on personal preference on how much detail you can and will perceive. You're also forgetting the ability of the GPU to push details across large panels.
well that is subjectively opinion, i would rather play on 1440p on high then 1080 ultra, usually higher resolutions bring better view experience, same as on 720 vs 1080 when on high or above cause that little extra details that you get from ultra is only there so it looks little better like lightning shadows and stuff. so to me games always looks better with more pixels then with more effects. if it was 1080 ultra vs 1440 medium i would pick 1080 (cause of huge difference in detail/effects amount from medium vs ultra then high vs ultra)
So it sounds as though 1440 high > 1080p Ultra > 1440 medium... in most scerios...
The other question would 1080p at a higher refresh. I can hold steady at 60fps at 1440p on high settings with mods and shaders on witcher 3 and skyrims. But would pushing it further to ultra with additional enb/shaders and say 80-90fps on 1080p be something to consider?
As I cant really take advantage of my 75hz refresh rate on the monitor at 1440p unless I either drop settings further or remove enbs/reshaders.
1440p is about 2x the pixels than 1080p. That means you have much less aliasing effects and good anti-aliasing can achieved easier. The picture quality improvement from 1080p to 1440p is big. Better than 1440p to 4k what is almost not noticeable, unless you play on screens larger 30".
I would always prefer 1440p over 1080p. but 60fps at 1080p is better than 30fps at 1440p. Graphic quality settings wise 1080p at 60fps on Very high is better than 60 fps at 1440p on medium or low.
Generally speaking, 1440p is the perfect gaming sweetspot right now as long as you have at least a GTX 1070.
I have a 1070ti now with an i7 7700k... And with a heavily modded skyrim and witcher 3 on ultra settings, with additional re-shade / ENB my FPS tanked at 1440p compared to 1080p... Under the same settings I was getting similar FPS / slightly better FPS at 1080p with a 1060 GTX.
But it sounds like re-shaders and ENB are very demanding at 1440p... If I reduce the settings to high and turn off a couple demanding ENB / reshade settings I can get around 60-70FPS at 1440p.
well, all those re-shaders and ENB shader stuff is modding stuff for future hardware. if it would be stuff that performs well, the developer would have put stuff like that into the game right from the beginning. For a lot of visual graphic mods you need mega ultra hardware to run properly, especially on 1440p. But 1080p is just getting a little dusty for my taste......and the picture is much nicer on 1440p. Especially on larger screens 24" or 27"