ref
Member
I tried TN panels before, both cheap and expensive ones, but the color accuracy are never on par with a good IPS. TN has many advantages for gaming, but for anything required color accuracy it will not work.
Edit: I just saw your edit. I don't have any of the monitors you mentioned. How does compare to Dell Ultrasharp?
Pretty similar, most high end 1440 IPS (PB278Q, Dell Ultrasharps, ViewSonic VP2770, etc) are all pretty much identical when calibrated. Only when side by side would you see some very minor differences.
But yes, absolutely, extreme color accuracy work wise IPS is the way to go. TN will not cut it.
If you can, try and see a Swift in action. I was an IPS only kinda guy, but I was so shocked how good the panel is compared to a calibrated high end IPS one. To me, for gaming, it was an obvious choice which one I would be using.