I haven't seen the vocal improv on the first until now. Far better then the more well known second night. I've personally always liked the first night over the second.
On both nights there are songs that are better performed than on one night for example Under Pressue is definetely better on the 2nd night than the 1st and Tie Your Mother Down is better on the 1st but not by much as both are great but overally i have really enjoyed both nights