To be fair the flat one is marketed more towards graphic designers, it has a built-in LUT also, unlike the curved model. That means you can load color profiles from calibrations onto the monitor directly.
After using the curved for like 4 days now I might take your advice and get the flat one. At first I was going to get the dell U2715h because I really like the thin borders also.
But the ultrawide really helps me for work, having a web on left and some code and photoshop on right etc..
Than was looking into some 4K monitors but think I am going to wait till OLED to make the swap. Just to scared at the moment with the scaling and clients logo's.