I found a 3rd choice for an ultrawide monitor, a Samsung Odessey 49DQHD, with a r1000mm curve.
I did a sketchup drawing to show the incredible differences between these 3 monitors for curves which vary between dell 3800r, Samsung CRG9 1800r, and this last one, with 1000r.
Ideally one wants to view a screen at 90 degrees, flat on. With these 3 ultrawide monitors, at the far edges, how far off 90 degrees is each, given the 3 different curvatures?
At the edges, the diagram shows that from a 24" seating distance, eye to monitor, the degrees away from a line perpendicular to he screen at the edge, for these 3 monitors, is approximately 38 degrees, 30 degrees, and 19 degrees respectively.
I would insert the diagram but a jpeg wont seem to upload into this message.
The 1000r curve monitor, with its strong curve, keeps the viewer's eye more straight on to the picture than lesser curved monitors.
Is this more important for maintaining color and contrast, than avoiding eyestrain?