I dont know if this pos of mine is relevant. But i feel that Musically and vocals wise, EVERY live u2 song, written and performed prior to the year 2000, sounded its best before the turn of the century.
Now, Bonos vocal especially, is mostly suited to singing the songs written post 2000.
I have long since been heard saying, that yeah, Bono might well be a technically more proficient singer this past 15 years or so, but he is nowehre near as raw, powerful and as soulful, as he was from the start, up till and including the Zoo TV Tour. Just my opinion.