Image processing is an art with no right or wrong. However, the vast majority of the general public prefers images that are brighter, more saturated, with higher contrast. It seems to be biologically hardwired. BTW image processing choices to please the masses are not just for smartphone vendors but television as well. Go to any Best Buy and the TV’s on display have brightness and saturation that are cranked to 11. That being said the enthusiast videophiles and photographers, unlike the Instagram crowd, do not prefer everything cranked to 11. They prefer accuracy and restraint. They don’t prefer skin texture to be processed to the point that it looks plastic or teeth looking perfectly white. Until the next big tech breakthrough comes most smartphone cameras are going to be very similar with differences mainly in the post processing choices. Pick the one you like. People have been using color science to pick between Canon, Nikon, and Sony cameras for many years.