I voted for the watch speech, because that's definitely the closest he's come to admitting his feelings for her. It was just one of those "Awwww" moments that was completely unexpected (for me, at least).
The "I'm your ally" speech is a close second. I really love that one too, but the watch one takes top honors in my book.
I loved the watch scene and the pier scene, and it was super hard to decide!!I ended up choosing the pier scene b/c I like the way the words are, I dunno, they are just very comforting. I also loved the watch scene, don't get me wrong!!