Anime all the way ♥︎
Western cartoons. Just... Western cartoons.
There are more action in the anime. American is just bunch of dancing and comedy.
Excluding excessive fan-service, they tend to have better plot, characters, character development, graphics, humor (usually isn't inappropriate or if it is it is very subtle). Besides, western-cartoons don't really have many good action, fantasy, or sci-fi. One could argue, Adventure Time and Samurai Jack! Which are good. But I'd much prefer Sword Art Online, Attack on Titan, and Steins;Gate.
Humor triumphs spikey hair and occasional pornography.