All the tours have been great and each have something different to offer.
As for show and production you can't beat the Popmart.
As for "touring", packing up the bags, going from city to city, producing a rock n roll show every other night. ZooTV. Even though the setlist was static, U2 gave it 110% this tour. Zooropa was born because of it.
I would put Vertigo up there too. U2 brought some of the alt. darkness back from ZooTV & Popmart on this tour. From the Boy set, Zoo Station encore, teary eye performance of RTSS or Miss Sarejevo. Pretty cool stuff.
Elevation started off great then turned into the greatest hits setlist during the 3rd leg. I saw my least favorite U2 show that leg.
I pick ZooTV