Definitely beauty within. Beauty on the outside is based on chance - some people are just born physically unattractive. However, beauty on the inside can compensate for that. It's worth more, because it's controlled by the person. It's their true nature - how they see the world, how they interact with it, how they treat others, etcetera. It's something that they've crafted overtime, forged through life and constantly improved or destroyed. Beauty on the outside can be important to some people, but in my opinion, it's best to judge others and choose your friends based on inner beauty. It's the one that shows you the true colors of humanity - whether that be something good or something to be feared.