I was bored, so I went to the U2 Gigs website and tried to figure out a thing or two regarding the songs being played on the past two tours. I'm sure someone else has done this before, but there's some interesting things there...
U2 Vertigo Tour - U2 on tour
Vertigo Tour: 131 shows
U2 360° Tour - U2 on tour
360 Tour: 110 shows
* New Song at the Time
Songs Played at Every Vertigo Show:
Sunday Bloody Sunday
Pride
Where the Streets Have No Name
Bullet the Blue Sky
One
Beautiful Day
Elevation
Vertigo* (with some shows getting it played twice)
SYCMIOYO*
City of Blinding Lights*
Songs Almost Played at Every Vertigo Show:
LAPOE* (127 times)
Songs Played at Every 360 Show:
Where the Streets Have No Name
One
Beautiful Day
Walk On
Vertigo
City of Blinding Lights
Get on Your Boots*
Crazy Tonight* (including one show where album version was also played)
Songs Almost Played at Every 360 Show:
With or Without You (109 times)
Moment of Surrender (108 times)
Sunday Bloody Sunday (108 times)
I suspect WOWY and MOS would've been played at every show had it not been for that rain delay in Europe that one time?
Songs Played On Vertigo That Are Mentioned As Being 'Played a Lot' In General (shows played at/total shows during tour):
With or Without You (104/131)
I Still Haven't Found What I'm Looking For (91/131)
Miss Sarajevo (85/131)
Mysterious Ways (67/131)
I Will Follow (51/131)
Until the End of the World (41/131)
Walk On (11/131)
Songs Played On 360 That Are Mentioned As Being 'Played a Lot' In General (shows played at/total shows during tour):
I Still Haven't Found What I'm Looking For (96/110)
Mysterious Ways (93/110)
Elevation (94/110)
Until the End of the World (82/110)
Miss Sarajevo (66/110)
Pride (65/110)
I Will Follow (42/110)
Stuck in a Moment (36/110)
In a Little While (50/110)
(only played twice on whole Vertigo tour)
Random Songs Played On Both Vertigo and 360:
The Fly: 89 times on Vertigo, 14 times on 360
Bad: 28 times on Vertigo, 13 times on 360
New Year's Day: 65 times on Vertigo, 29 times on 360
Desire: 6 times on Vertigo, 9 times on 360
Out of Control: 9 times on Vertigo, 6 times on 360
All I Want Is You: 23 times on Vertigo, 12 times on 360
Of course, this doesn't stop the debate of them not playing certain songs enough or at all, but it's still interesting to see some perspective on this.