Most users prefer Dark Mode because it looks better. But, it has also been said that Dark Mode puts less strain on the eyes, and it doesn't affect melatonin levels (meaning you can't fall asleep after playing on your phone before bed.) Dark Mode also uses less battery life than the brighter alternative. Overall, Dark Mode is a popular feature for a good reason. However, some people prefer the standard interface, which is why you can always switch back if you'd like.