different materials. regular tufo tape has a flimsy paper backing, and it tears and breaks when you mount the tire on and try to peel it back. the tape itself sticks to itself and rolls inward toward the middle of the rim instead of laying flat against the edges.
conti tires are great! i figured i'd try the S22's because i've been hearing such good reviews on them and i wanted to try a slightly lighter tire.
tufo extreme tape has a plastic backing that peels off in one smooth motion, and the tape itself is an easier to work with compound.
and its supposedly wayyy tackier.
there's a pretty good tubular thread over in the SS/FG forums here. its worth reading up on.