Being a three-bike person: 28mm Schwalbe Marathon+ on the Giant Defy4 commuter (as far as I remember, only one puncture in about 10,000 miles), Bontrager Racelite hardshell on the winter bike, and either Continental GP4000s or Schwalbe Ultremo ZXs on the posh bike. I've had the most punctures on the latter (I'm happy to trade off the occasional inconvenience of a puncture for the lightness, speed and grippiness of decent race tyres.) I haven't really got on that well with Gatorskins: they are neither bombproof, nor particularly light, fast or grippy. I haven't tried the hardshells, but I guess thay are a response to the Bontragers, which seem to have quite a good reputation for winter riding.
Marathon+ are heavy, slow, and not the grippiest tyres around. But the last thing I want is a puncture on my finely-tuned ride into work. And riding a tank with heavy tyres on every day only serves to make my posher bikes feel even lighter and faster.