I have not had the chance to see Vertigo outdoors, but nonetheless here is my analysis.
I can summarize the difference this way:
Popmart was more of a 'performance production' than Vertigo which is more of a straightforward 'rock production.'
I think all setpieces need to be included when stages are compared and the bottom line is Popmart had a drivable, rotating, hydralic-opening mirrorball lemon that transported the band to the center of the stadium.
I am fairly certain that no other tour in the history of rock will be able to say this.
That said, I believe the Popmart stage platform itself was a tad boring. it was basically a flat rectangle, with a couple of underworlds on either side.
It is really hard to compare them because one stage is so much more technologically advanced than the other. Then again, there is something to be said for vintage.
It is like comparing a 2005 Enzo Ferrari with a 1962 250 GTO. At their respective times, they were on the cutting edge of technology, one is now just more current.
The Vertigo screen has about the same amount of LEDS in one of the Barco tiles as the Popmart screen had in about one square meter (widely estimating here.) I mean the Popmart screen basically INVENTED LED screens as we know them today.
The olive was cool, the graphics in my opinion were superior in Popmart as they went with a theme (pop art), but the arch to me is what sets that tour off from all others.
ZOOTV was my favorite for its excess, but the arch was such an elegant display of engineering. Form and function. The form obviously was a big middlefinger to McDonalds, but the way it functioned was highly impressive. From its constructability (steel arch truss with pulleys to pull the yellow pieces up onto it) to its content, the arch alone had rope lights, moveable lights, stationary lights, and followspot postions built-in. Then of course, there was the Bono-in-mono sound system. You have to imagine how much that big orange sucker weighed and basically was tied into the arch with a cantilever from the screen. It is that moment when Fisher showed his true genius as an architect.
This was the first time he used water tanks as ballast to hold the stage in place, and one of the first times generic steel frames were toured leapfrogging each other. Then there were the xenons. I will never forget when the xenon lights that surrounded the stadium were turned on, they were the brightest lights I had ever seen, and how they simply projected onto the clouds was amazing. I think I remember a story that the touring crew notified the FAA in each city that they were using these lights so that commercial pilots would know what they were and were not distracted by them.
Then there was the Chinese yo-yo screen. Forgetting for a moment that the LEDs were developed for this screen, and forgetting that they were custom mounted on aluminum tubes, it was the construction method for me that made this impressive. Each vertical strip of the screen folded down into a flight case for transport, and basically plugged in when constructed. The fact that sucker worked by the end of the tour is amazing. I mean think of the weather they played in and all the places they took it.
Then there is Vertigo.
I mean we have all studied this thing ad infinitum from the guessing renderings that were sent out to the actually bloody thing. I think the one word that can be used to summarize this design is efficiency. I mean the band did not spare any money on this, and it was custom built, but the way in which they use it is very cost effective. Basically the stage that the band plays on is the indoor Vertigo stage, but layed out in a different arrangement. So the embedded floor LEDs are there, but the ellipse is just reorganized to make two wings at the front of the stage under the PA. I think this is becoming precedent as Fisher utilized the same idea for the Rolling Stones. For Bigger Bang all they do is build a scaffold platform, and then assemble the arena stage on top of it to give it greater height. No more need for touring indoor and outdoor stages, they simply use one, with supplementary platforms for the outdoor shows.
Now again, I have never seen outdoor Vertigo, but I am not convinced by the double B stage. it could be very cool, but it seems half-assed. I mean look at ZOOTV with its Trabant hanging above the B-Stage, or Popmart's driving lemon to the B. I just think something is missing from the execution of this design.
The screen looks pretty cool, but as the arena Vertigo show has been compared to Elevation, I do think the outdoor Vertigo screen has to be compared to Popmart. I mean obviously it is the same idea, big screen behind stage, but the fact that Williams separates the Barco tiles to make a bigger screen decreases the resolution, bringing it closer to Popmart. I mean of course, if the entire size of that screen were filled with LEDS, the resolution would be so much better, but I am guessing due to cost and time, this was chosen.
The sound system of Vertigo does look massive, and the screens above the sound system look vivid, but they follow my disapproval of the four screens they utilize indoors. I just think that whole concept is not only dated, but quite distracting.
I am very much interested in the spotlights located behind the screen, and the moveable operation of the lower section of the screen, but overall I think it is a decent design.
To compare them, I would have to give the nod to Popmart as the production had a bigger impact to me, and had a very clear theme. Looking back in time, I think the U2 tours that will be remembered the most will be the ones that had some thematic drive behind them. ZOOTV, Popmart, and hell - even The Joshua Tree (U2 conquers America) will go down as classics, whereas Vertigo will be remembered as Elevation's bigger, smarter, better looking brother.
Those are my thoughts and sorry for using so many words....