UltraHD or 3200p downscaled to 1600p?

I'm having a true first world problem.



I'm lucky enough to own a 32" UltraHD screen (Asus PQ321QE) and a 30" 1600p screen (Dell 3007 WFP-HC). As you are no doubt aware, Nvidia have brought out DSR, which can actually allow me to render at 5120x3200 and then downscale to 2560x1600. And I can't make up my mind which I prefer!



UltraHD advantages:



Less performance demanding* (never thought I'd write that!)

Fine pixel pitch allows fine details to really come out

Beautiful colours



UltraHD disadvantages:



Still can notice 'shimmering' antialiasing effect when in motion

Very slight lag (not enough for me to care)

Can get 'split' screen issues at low framerates



3200p advantages:



No 'shimmering' antialiasing effect

Holy crap! I'm rendering at 3200p!

More 'stable' than UltraHD

Game doesn't support AA? Now it does!

No lag



3200p disadvantages:



Lower pixel density means you can see individual pixels when concentrating

Using it means my nice UltraHD monitor goes to waste

Colours not quite as good as UltraHD monitor (though still damn good!)

More performance demanding*

Stupidly small writing / HUD scaling



*For now, don't worry about performance issues - I have a solution to that.



Of course, if Nvidia would just release 8K downscaling, this would be a much easier dilemma to solve.



Let me know your thoughts peeps!

UltraHD or 3200p downscaled to 1600p?