I had seen several sources that said Top of the Rock at Rockefeller Center was better than Empire State Building, but I strongly disagree. We did both to see for ourselves and agreed the views from ESB blew those at TOTR away! We also went to ESB around midnight (they're open til 2:00 am). There were still quite a few people visiting, but it was definitely much less crowded. You can stand there and enjoy the view without feeling pressure to move on so someone else could see. You can't be the NYC skyline all lit up at night!