Ariel and Belle are the most beloved and popular disney princesses in Fanpop. To tell the truth, Belle has slightly mais fans. She is pretty, sure, but beautiful? Not likely. She has brown hair and hazel eyes (that's a charmer) but to me it looks quite plain. And she's pretty but she's TOTALLY ANAWARE OF IT? Really? Like she didn't see it when she looked in that mirror?
But Ariel was completely aware of it. She tried to be good-looking in front of her dream boy. Red hair and blue eyes are a lot prettier than brown hair and hazel eyes to me.
Belle reads (which is why people like her) and seeks for adventure, while Ariel fights for what she wants to get it. Sure, Belle does think of others first and Ariel is a bit selfish, but Belle also is TOO perfect. Nobody's perfect. At least Ariel made mistakes and we can relate to her.
So as you can see, this is why I prefer Ariel a lot mais than Belle.