I had higher PPI coming from 27" 4K. All the text and stuff seems natural at 34" UW, though. Not done much in the way of gaming yet. But as I am using an RTX 3080 eGPU, I think I will favour the lower res a bit tbh. My 4090 with my 65" 4K OLED upstairs nowadays.
Having now made the swicth to 34" UW 1440P OLED, I haven't missed the 4K res at all, all the other avantages more than negate the loss of of the extra pixels, and more FPS.