After visiting in May, my wife and I decided we loved both Barcelona and Madrid. However, she preferred Barcelona and I preferred Madrid, though it was close in both cases. She liked the old quarter's twisted lanes and the funky-Modernisme architecture of Barcelona while I preferred the stately, grand architecture and compact tourist area combined with a bigger city vibe in Madrid.
I'm interested in others opinions. No right answers, just your thoughts. If you had to pick for your next trip: Barcelona or Madrid and why?