Don’t forget the distance that you are viewing the display from.
Having many pixels per square inch is nice but for those of us who are in the ‘bifocal age’ of our lives we want to be able to see what is on the screen without leaving a nose print! Most can see the detail shown on the larger (less pixel dense) display units because we can see them from a normal seated-driving position or more importantly from the deck while working the trolling motor at the bow.