It's impossible to say which show this tour has been their best. No one has seen each and every concert. Also, even at the same concert experiences differ due to circumstances (where you end up, who is next to you, how your general mood is that day, what your expectations are).
That said, of the shows I've seen, these are the top ones:
- Barcelona 2: All the things that did not go smoothly on the first night they nailed it on the second. It gelled, it worked, it awed us, it was amazing.
- Amsterdam 2: Quite a setlist change, three tour premieres and a crowd that was completely into it.
- London 2: Excellent performances, great crowd and a great vibe overall.
But my favourite one has been:
Boston II
I can't really describe it. It is Boston, so the crowd LOVES U2. And they loved Snow Patrol too, who opened for the last time. Not opening with Breathe. UTEOTW with Melissa onstage (who was excellent). The Boston flag that got onstage during Unknown Caller. The overall performance.
After this concert I just wanted to hug everyone I saw. It was that good.