Is IPS the only technology available? I mentioned "IPS", assuming it was the best.
There is also TN and VA. IPS is best for colour reproduction, uniformity and viewing angles. That said, some of the newer so-called 'premium' IPS panels aren't all that hot when it comes to uniformity, as well as numerous other QC issues, bleed etc. Traditionally though, IPS has always been very good in this regard, with only IPS glow being an issue... but a QUALITY IPS panel should not suffer from this too badly. IPS is preferred by graphics professionals and photographers due to its excellent colour reproduction, but the current fast IPS panel in the
Asus PG279Q for example, and the
Acer X34 are aimed more at gamers anyway... but they do have issues, so best to read up on the forum threads for those.
TN will have faster response time than IPS (many people don't notice that though), but colour reproduction is worse and they will invariably suffer from gamma shift and uniformity issues... even looking straight on you will often see a difference between the top and bottom of the screen, and colours will look more 'washed out'. Some people, like myself, can't stand this, but I've always had IPS so TN just doesn't work for me at all.
VA is another alternative, but there aren't that many options there (
THIS is the only one that I've seen). The Samsung 21:9
S34E790C could be worth looking at though. Some people find VA preferable to TN and IPS due to its superior blacks. This monitor is limited to 60Hz though, with no variable sync technology. If you want a fast panel with either G-Sync or Freesync, you would have to look at IPS or TN.
Ultimately monitor choice will come down to what you want to use it for, and what is most important to you. Unfortunately though, as mentioned, there is no monitor on the market that is guaranteed not to have backlight bleed.
