This was always a great site to see the screen resolution comparison:
https://www.paintcodeapp.com/news/iphone-6-screens-demystified
The Plus screens have point resolutions of 414x736 but rendered at 3x fr 1242x2208 and then downsampled by 1.15 to fit the 1920x1080 physical screen.
I'm firmly in the camp that feels 326ppi is a good option and likely best suited for where the 11/XR are in the lineup, though I do recall being able to see the difference between 326ppi and 401ppi when placed side by side, specifically when comparing text. It's one of the reasons why I would go with the Pro model over the 11 if choosing, though it does suck for those who suffer from the PWM in the OLED display.