What was more fruitful to Santiago—the treasure at the end or the journey itself? Explain by providing three examples from The Alchemist.

The answer to this question is subjective, and it is best left up to individual readers. You are certainly able to argue that Santiago's monetary prize at the end of the story was worth far more than the journey itself, but I think that would be a mistake. Santiago's search for his Personal Legend was far more beneficial to him. His journey is what allowed him to meet Fatima in the first place and learn that love is worth far more than any prize.
His journey also led him to the crystal merchant that taught him that achieving a goal is all about doing. Santiago can't sit and be complacent if he wants to achieve the treasure and his Personal Legend. Santiago's journey also taught him that anything worth obtaining is never going to be easy to obtain. Santiago's journey was met with pitfall after pitfall, yet he kept on persevering. That never give up attitude is ultimately what allowed Santiago to achieve so much. Without the journey, the treasure wouldn't have been obtained.