[QUOTE=froze]The Armadillo has a puncture resistent sidewall that the Gatorskin does not have.


The Gatorskins have a bead to bead protecting layer that does protect the sidewall, but they have an extra layer under the tread area. I have used Armadillos for commuting, and am currently riding Gatorskins for recreation. The Gatorskins are just as rough feeling to me as the Armadillos, since both have stiff sidewalls. I have only had one flat on rec rides on a Gatorskin, and one pinch flat one time on an Armadillo. If the bike will fit them, I recommend the 700X25 Armadillos, running around 100 psi. These would only clear on my Trek 1000, not my other bikes. The 25s are bigger than most, looking like other company's 28s and even 32s. My present bikes will only fit the 23s. Even with the higher pressures, the ride still has not much rolling resistance. It feels like I'm using no effort when cruising on smooth, flat pavement. The older version of Armadillos had a separation problem that was corrected on the present models. When my Gatorskins wear out on my Trek 420, I might switch back to Armadillos