Is there really that much difference between 4K and 1440p?

I recently bought an RX 9070XT, I'm undecided: buy a 4K or 1440p monitor, I specify that I would take both OLEDs. Is there really that much difference? I saw that the 9070XT is excellent especially for 1440p while for 4K it struggles in some games. I specify that I only play more "cinematic" singleplayer games