Yeah, my monitor, which i believe i might have seen mentioned on gaf or even the Titanfall 1 before is a an Asus mx279h. It seems very much like the Dell you suggested. I've read up on the differences between TN and IPS and yeah for console gaming IPS monitors seem like the better value (i probably read that before as well when i decided to purchase this monitor) but for whatever reason i could never get it to look right. I'm not a fan of 27inches that's for sure. Rather keep it at 24.
Reading up on your monitor, it's quite old. Supposedly, it has quite bad response times.
FWIW, these tests are a little arbitrary, but that's on the poor end. As for colours, no I can't find any proper tests, but it was average for its time for sRBG back in 2013. It also apparently has average viewing angles for an IPS.
I think in this case, the U2414h would be quite the upgrade, but bare with me.
I read a lot of Asus monitors don't have flicker free tech? After a while i do get fatigued with this monitor. That's another issue. I've also tried to adjust the Xbox settings from RGB PC to TV or whatever that option is. Without the PC RGB option the blacks get all washed out. Nothing i do in the monitor settings help much.
For "flicker-free", I can't say I know what it's like to not have it. U2414H was the second screen I bought/used and it is. I don't think you need to consider this on later models, but in case you wanted to cross-reference:
There has been a massive surge in the focus on ‘flicker-free' monitors from many manufacturers since this list was first introduced on TFTCentral. As a result, the list is almost certainly not exhaustive. We will try to keep it updated for now, but at some point we will probably have to stop maintaining it. We will of course continue to mention whether upcoming models have a flicker-free backlight in our news pieces. We will also continue to test for this in our reviews.
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http://www.tftcentral.co.uk/articles/flicker_free_database.htm
For PC RGB, typically, if you have a PC Monitor, you want to be using that. Some monitors can accept TV/Limited, but not all. tl;dr, your Xbox and screen just has to match and it'll look correct.
Your issues with colour are most likely poor calibration mixed with a relatively older screen. Thankfully, 2015 onwards monitors have been really good having factory calibrated colours, so when you get your new screen you won't have to fiddle with it.
So, Titanfall 2 on PS4 pro is 1440p? At what frame rate? So i should be shooting for a higher res monitor then eh?
Depends on your budget, tbh.
Since you're looking at Scorpio, you wouldn't go wrong with a 4k screen. Especially since you're console only, 60hz and the fact that you don't need adaptive refresh means you have a lot of options.
As for the U2414h suggestion, it's really only because, despite holding its value after all these years, it's comparable with IQ with even recent IPS.
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Suggestions:
If your budget is huge, then look in any recent PC Monitor thread on GAF for the current monsters, otherwise...
BenQ GL2460HM
ASUS VC239H
These are priced very good and are essentially great at 1080p, 24" IPS panels with ~2ms response times.
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If you want to go higher than 1080p, and go to 4k, there's a really good IPS 4K panel (it's 27" though) LG 27UD68P
My issue with this screen is that it's priced almost the same as some of the later screens we're gunna get.
Final note: while 4k > 1080p, the Scorpio will take a game at 4k or whatever and downscale to 1080p, meaning that you still get IQ benefits.