Looking at it as a handheld screen
3DS - 240p - 3.5 in
Wii U - 480p - 6.2 in
Vita - 544p - 5 in
Switch - 720p - 6.2 in
Based off my extensive experience with the 3DS and Vita I actually am quite impressed by the Switch. If the games are there and can find a way to make battery not an issue it is an appealing handheld.