4K with 0.6 shading rate vs 1440p with 1.0 shading rate, which one provides the best IQ?

[Artins90]

I use resolution sliders quite often and they are very handy for my limited setup.
This is the first time I see a shading rate slider instead of an internal resolution one.
I can't pick between these 2 combinations, which one do you think looks the best?

[MancSoulja]

Shading rate determines how many shaders are used per pixel, so at 0.6 that's nearly half the shaders per pixel, 1440p will almost certainly look better.

[Jig McGalliger]

Look at the raw pixel count:
4K = 6134400 px * .6 = 3680640 px
1440p = 3686400 px

You're getting more pixels with 1440p, but barely. The slider still has to scale the internal image with a filter (presumably gaussian based)

Depending on your rig and desired performance. Currently on my 2070 I started using RTX at 1440p and shader scaled to .8 which pushes more pixels and looks a lot better than 1080p scaling to my 1440p monitor. End result is 2.95M pixels compared to like the 2.07M 1080p has.

If you monitor's native resolution is 4K, and scaling 1440p to 4k doesn't smear the image much, you might want to use 1440p. Otherwise I say stick with 4k if you can hit .7 scaling without FPS drops.

[Artins90]

My LG 27UK650 display has a great scaler, 1440p looks nearly identical to a native 1440p.
4K 0.7 shading is feasible but there are framedrops from time to time, I think I'll settle with 1440p.
Thank you for your replies guys.