Originally Posted by blwyn
I've gone about 5,000 miles with an Armadillo on the front and a Gatorskin (2) on the back. The miles have been mostly commuting miles with plenty of broken glass along the way. In that time I've had 4 flats on the Gatorskins, none on the Armadillo. All of the flats have come from broken glass. I would say that the Armadillo is the tougher tire. I've had no flats on it and it looks like it is good for another 2,000 miles. However, in fairness, rear tires always flat more often and wear out quicker than front tires. Next time I'll put the Armadillo on the back for a full comparison.
Although the Armadillo may be the tougher tire, you cannot neccessarily conclude that from your setup. Rear tires are far more susceptible to flats than front because there is more weight on the rear tire. If you really want to compare tires, swap the front and rear and see if you get the same performance.
If the Armadillos are the tougher tire, than you are better having it on the rear anyway.